Systematic Identification of Cardiotoxic E-Cigarette Flavorants

The goal of this study is to examine how individual flavorants in e-cigarettes modify the effects of e-cigarette aerosol exposures on the electrical activities of the heart (i.e., cardiac electrophysiology), leading to heart arrhythmias and functional remodeling. Researchers will identify short-term and long-term effects of flavorant exposure on cardiac electrophysiology in mice by using various state-of-the-art analytical approaches. Study aims are: (1) to identify the short-term effects of flavored e-cigarette aerosol inhalation on cardiac electrophysiology; (2) to examine the direct impact of flavorants on cardiac electrophysiology by examining cardiac myocyte function; and (3) to clarify the impacts of individual flavorants on the short- and long-term impacts of e-cigarette aerosol exposures on cardiac electrophysiology, structure, and function. This study will provide new data on the cardiac toxicity of e-cigarette flavorants.

Evaluating the Potential Impact of a Menthol Ban in Cigarettes and E-Cigarettes Among Current Menthol Smokers

The goal of this study is to model the impact of different menthol regulatory scenarios on real-world smoking behavior. Study aims are: (1) to examine the impact of banning menthol flavor in cigarettes and e-cigarettes on smoking behavior and (2) to investigate whether outcomes differ by race to understand the impact of menthol ban policies on Black (vs. non-Black) individuals, given high rates of menthol cigarette use in this population. Researchers will recruit 150 adults (ages 21+) who currently smoke menthol cigarettes and will provide them with cigarette and e-cigarette products to use for 8 weeks; subjects will be randomized to one of three study conditions in which they will receive products as follows: (1) no menthol ban (menthol cigarettes and menthol flavored e-cigarettes), (2) menthol ban on cigarettes only (non-menthol cigarettes and menthol flavored e-cigarettes), or (3) menthol ban on both cigarettes and e-cigarettes (non-menthol cigarettes and tobacco flavored e-cigarettes). A follow-up survey at 12 weeks will assess changes in the number of cigarettes smoked per day (the primary study outcome) as well as percent days smoke-free, changes in nicotine dependence, and motivation, confidence, and intention to quit smoking. Findings may inform regulatory activities related to menthol.

Novel “Tobacco-Free” Oral Nicotine Pouches: The Impact of Product Features and Marketing Influences on Abuse Liability, Perceptions, and Use Behavior in Smokers and Non-Nicotine Users

A novel class of oral nicotine pouches that contain a nicotine powder instead of tobacco leaves has recently emerged; these pouches often contain non-tobacco flavors (e.g., fruit) with known appeal to youth. The goal of this study is to describe nicotine pouch product features and marketing tactics that may drive initiation and continued use among smokers and non-nicotine users, including youth. Study aims are: (1) to examine how pouch flavors and nicotine doses impact pharmacokinetics (PK), or how nicotine moves through the body, and pharmacodynamics (PD), or the effects a person feels after using a drug, in cigarette smokers; (2) to characterize nicotine pouch marketing tactics in advertisements and examine the influence of these tactics on cigarette smokers’ and youth non-nicotine users’ product perceptions; and (3) to examine how a common marketing tactic (e.g., “tobacco-free” descriptors) impacts use behaviors and PK/PD effects in cigarette smokers and non-nicotine users. To achieve Aim 1, 28 smokers (ages 21+) will use pouches of different flavors (tobacco, mint, fruit) and nicotine doses (low, high), and their own brand of cigarettes over seven laboratory sessions, and PK and PD effects (e.g., subjective abuse liability, tobacco withdrawal) will be assessed. In Aim 2, researchers will review nicotine pouch advertisements over 5 years to identify/monitor marketing tactics and examine, via web-based experiments, how common tactics influence product perceptions (i.e., perceived harm, addictiveness, appeal) and use intentions among 2,500 adult (ages 21+) cigarette smokers and 2,500 youth (ages 13-20) non-nicotine users. In Aim 3, researchers will conduct a second laboratory study with 60 smokers and 60 non-nicotine users (ages 21+) to determine how a common marketing tactic identified from the Aim 2 marketing analysis (“tobacco-free” descriptors) impacts pouch use behaviors and PK/PD effects. Findings may inform future regulatory activities related to novel oral nicotine pouches.

The Effect of Menthol on ENDS Users’ Dependence, Respiratory, and Toxicants Emission Outcomes

The goal of this study is to clarify how menthol affects electronic nicotine delivery system (ENDS) users’ experience and puffing patterns, which in turn affect dependence, exposure to toxicants, and clinical outcomes. In this study, 200 current/past month closed-system ENDS users (ages 21-35) will attend two laboratory sessions and use their ENDS once with menthol flavor and once with tobacco flavor. Study aims are: (1) to test the effects of menthol vs. tobacco flavor on subjective, puffing, and respiratory outcomes including pre-post-use assessment of craving, withdrawal, satisfaction, harm perception, intention to quit or use, respiratory functions, and symptoms (e.g., dry mouth, irritation, cough, palpitation, nausea); and (2) to use a smoking robot to measure the effects of menthol vs. tobacco flavor on ENDS emissions of 14 aldehydes. Findings may inform future regulatory activities related to the use of menthol flavor in ENDS.

The Impact of Menthol Flavoring on Switching in Adult Menthol Smokers

More information about the impact of menthol-flavored e-cigarettes in enabling menthol cigarette smokers to switch to e-cigarettes would be useful. The goal of this study is to compare the efficacy of menthol-flavored versus tobacco-flavored e-cigarettes in facilitating switching from combustible cigarettes to e-cigarettes among adult menthol smokers. Researchers will randomize 800 menthol smokers (≥ age 21) into a 12-week trial comparing menthol-flavored and tobacco-flavored e-cigarettes, with follow-up at week 26. Study aims are: (1) to compare the effectiveness of menthol versus tobacco e-cigarettes at facilitating switching (measured by cigarette and e-cigarette use patterns) at week 12; (2) to compare tobacco harm reduction of menthol versus tobacco e-cigarettes (measured by self-reported health-related quality of life, expired carbon monoxide, respiratory measures, and blood pressure) at week 12; (3) to compare the acceptability of menthol versus tobacco e-cigarettes (measured by product use; effects on withdrawal, craving, and dependence; and subjective and sensory effects) at week 12; and (4) to examine the long-term use of menthol versus tobacco e-cigarettes at week 26. Findings may inform future regulatory activities related to menthol flavoring in e-cigarettes.

Nicotine Flux, A Potentially Powerful Tool for Regulating Nicotine Delivery from Electronic Cigarettes: Significance of Nicotine Flux to the Rate of Nicotine Delivery and Subjective Effects

The rate at which electronic nicotine delivery systems (ENDS) emit nicotine (“nicotine flux”) can be predicted based on knowledge of a few device design and operating variables. The goal of this study is to provide empirical evidence demonstrating the relationship between nicotine flux and nicotine delivery and between nicotine flux and the physiological and subjective effects that support nicotine dependence. Study aims are: (1) to examine the relationship between nicotine flux, nicotine form, and the rate and dose of nicotine delivery, and (2) to assess the relationship between nicotine flux, nicotine form, and subjective effects. To achieve Aim 1, participants will puff on ENDS devices under conditions that differ by flux and form while arterial blood is sampled for nicotine levels; the outcome will indicate the degree to which nicotine flux and form determine the speed and dose of ENDS nicotine delivery, and thus, abuse liability. To achieve Aim 2, participants will use ENDS devices with varying nicotine fluxes and forms, and dependency measures such as urge to smoke, craving, and abstinence will be assessed; the outcome will indicate the degree to which nicotine flux/form influence subjective effects related to dependency, puffing intensity, and toxicant exposure. Findings may provide evidence for using nicotine flux to inform possible regulatory activities.

CTP Supplement to Parent Grant: Chronic Hookah (Waterpipe) Smoking, Vascular Dysfunction, Inflammation and Oxidative Stress

As a supplement to a parent grant, this study will further examine the long-term health effects of hookah smoking by evaluating autonomic nervous system regulations of the heart and identifying additional biomarkers of harm that could be used to evaluate and monitor the effects of chronic hookah smoking on cardiovascular health. In a group of generally 34 healthy chronic hookah smokers ages 21-49 who do not smoke cigarettes — matched with 34 cigarette smokers and 34 nonsmokers — researchers will examine: (1) cardiac sympathetic nerve activity measured by heart rate variability; and (2) biological markers of inflammation and oxidative stress, including: (a) interleukin-6 and tumor necrosis factor-a; (b) free polyunsaturated fatty acids and oxidized metabolites, assessed by mass spectrometry; and (c) concentrations of glutathione, bilirubin, heme oxygenase-1, and functional activity of paraoxonase1, determined by colorimetric and enzymatic assays. Findings will provide new information about the cardiovascular effects of hookah smoking.

Determinants and Health Effects of Dynamic Changes in E-Cigarette use Before, During, and After Pregnancy

The goal of this secondary data analysis is to examine changes in maternal e-cigarette use before, during, and after pregnancy, determinants of these changes, and their effects on maternal and infant health. Study aims are: (1) to examine determinants of changes in e-cigarette use before, during, and after pregnancy; and (2) to assess health outcomes associated with changes in e-cigarette use (discontinuing, switching, and relapsing) before, during, and after pregnancy. Researchers will analyze data from two large U.S. national studies: the Pregnancy Risk Assessment Monitoring System (PRAMS) with N=153,336 existing mothers during 2016-2019 plus new mothers in 2020-2021, and the Population Assessment of Tobacco and Health (PATH) Study with N=4,392 existing pregnancies in waves 1-4 during 2013-2017 plus new pregnancies in wave 5 during 2018-2019 and the adult telephone survey in 2020. Potential determinants of e-cigarette use changes to be evaluated will include socio-demographics, pregnancy intention and characteristics, baseline e-cigarette use and product features, risk perception of e-cigarette use, concurrent substance use, and time of survey. Prenatal outcomes will include gestational weight gain and gestational duration. Neonatal outcomes will include small-for-gestational-age birth, mode of delivery, and length of infant hospital stay. Postpartum outcomes will include breastfeeding and postpartum depression. Findings will provide new information about changes in e-cigarette use and its effects on maternal and child health.

Can Machine Generated Nicotine Yield Predict Human Nicotine Exposure from ENDS?

The goal of this study is to examine whether machine-generated nicotine yield from electronic nicotine delivery systems (ENDS) can predict human exposure to nicotine. Study aims are: (1) to determine whether nicotine yields generated from machine-vaped ENDS are associated with human nicotine exposure following prescribed or ad libitum ENDS use, and (2) to determine which machine-vaping regimes (e.g., CORESTA, intense, playback of human puff topography), if any, are most effective for estimating human exposure to nicotine. Researchers will also investigate how changes in ENDS nicotine yield may affect nicotine pharmacokinetics, pharmacodynamics, non-nicotine HPHC exposure, subjective effects, and puff topography. In this randomized study, 32 current ENDS users (ages 21-65) will complete four experimental visits during which they will use an ENDS containing one of four e-liquid nicotine concentrations (i.e., very low, low, medium, high) under prescribed and ad libitum use conditions; researchers will then measure nicotine pharmacokinetic parameters (e.g., maximum plasma nicotine concentration) to determine nicotine exposure and compare it to machine-generated yields. Results will help determine whether nicotine yield data can be used to estimate human exposure to nicotine from ENDS, whether these data can be used to draw inferences regarding ENDS abuse liability, and whether certain machine-puffing regimens are most suitable for estimating human nicotine exposure from ENDS.

Strengthening Cigar Warnings to Prevent Adolescent Use

In 2016, the Food and Drug Administration (FDA) mandated six rotating text-only warning statements to be placed on little cigar and cigarillo (LCC) packaging. The goal of this study is to advance the science on LCC warnings that are effective for youth ages 15-20 who currently use, have ever used, or are susceptible to using LCCs, especially Black/African American youth. Study aims are: (1) to identify the most effective images to pair with FDA-mandated LCC text-only warning statements using a youth advisory board and a quantitative online survey delivered to 500 youth; (2) to examine whether LCC warning size (30% vs 50% on the LCC package principle display panels) and type (text-only vs. text+image) affect perceived message effectiveness of LCC warnings among an online sample of 500 youth; and (3) to conduct a randomized controlled trial with 900 youth to test whether the most effective LCC warnings from Aim 2 reduce willingness to use LCCs (compared to the text-only 30% size FDA-mandated LCC warnings and a control condition). Findings may inform regulatory activities related to LCC warnings.

Effect of Tobacco Use Patterns on Toxicant Exposure and Successful Cessation: A Longitudinal Study among US Adult Cigarette Smokers

Researchers will analyze data from Waves 1-5 of the Population Assessment of Tobacco and Health (PATH) Study to identify groups of adult smokers defined by their toxicant exposure and investigate how levels of nicotine dependence and patterns of tobacco use could impact adults’ ability to achieve successful smoking cessation (smoking abstinence ≥3 months). Study aims are: (1) to analyze data on biomarkers of exposure to tobacco chemicals (i.e., nicotine, tobacco-specific nitrosamines, polycyclic aromatic hydrocarbons, volatile organic compounds) in 8,000 adult current cigarette smokers and group those smokers based on toxicant concentrations detected in urine; researchers will examine whether groups differ by personal characteristics, smoking behaviors (e.g., menthol vs. non-menthol smoking; cigarette smoking only or polytobacco use), and level of nicotine dependence; and (2) to describe trends in nicotine dependence and smoking behaviors to identify characteristics and behaviors of adults who achieved successful smoking cessation. Findings may inform regulatory and research activities that address tobacco-related toxicant exposure and will shed light on barriers and facilitators to achieving successful smoking cessation in adults.

Development of Biomarkers of Exposure and Effects for Electronic Cigarette vs. Combustible Cigarette Use

E-cigarette use has been associated with a variety of diseases, including cancer. The goal of this study is to detect genetic and epigenetic (i.e., behavioral, environmental) alterations in key genes in the oral and blood cells of 45 healthy adult vapers and 45 healthy adult smokers in comparison to a control group (45 nonsmokers/non-vapers) matched for age, sex, and race. Study aims are: (1) to screen for the deregulation (i.e., functional impairment) of disease-related genes in oral and blood cells of vapers and smokers as compared to controls; (2) after identifying the deregulated genes, to employ targeted next-generation sequencing (a method of analyzing DNA) to detect genetic changes in the deregulated genes; and (3) to employ targeted next-generation sequencing to detect epigenetic modifications to the deregulated genes. As a secondary goal, researchers will identify correlations between the identified genetic changes and subjects’ tobacco product use patterns and product characteristics (e.g., e-cigarette device features; e-liquid content; cigarette brand, type, and chemical constituents); this will clarify the impact of vaping/smoking dose and product characteristics on the biological effects of e-cigarette use vs. cigarette smoking. Study findings will identify gene changes that can serve as biomarkers to differentiate among vapers, smokers, and nonsmokers/non-vapers, thereby indicating the health risks and/or potential benefits of e-cigarette use relative to smoking.

Pulmonary Toxicological Evaluation and Chemical Interactions of Menthol, Mint, and Tobacco Flavored E-Cigarette Products

Menthol/mint and tobacco flavors contain harmful chemicals that can cause adverse cellular and molecular changes in lung tissue. The goal of this study is to identify constituents of menthol/cooling and tobacco flavors and their pulmonary toxicity and to determine potential biomarkers of disease. Study aims are: (1) to identify the chemistry of menthol, menthol-like (cooling), and tobacco flavors, including flavoring chemicals and secondary products formed upon aerosolization; (2) to determine the in vitro and in vivo toxicity and health effects of menthol, menthol-like, and tobacco-flavored electronic nicotine delivery systems (ENDS) in EpiAirway 3D tissues (tissues constructed of human tracheal/bronchial epithelial cells) and in mice under normal and pre-existing respiratory conditions (chronic obstructive pulmonary disease and asthma) (3) to determine in vitro and in vivo toxicity and health effects of exposure to responsible flavoring chemicals identified in Aim1 using EpiAirway 3D tissues and mice under normal and pre-existing respiratory conditions. Findings will provide new information about lung toxicity caused by menthol and tobacco flavored e-cigs, identify disease processes of asthma and COPD upon switching to menthol and tobacco flavors from combustible cigarettes, and identify the culprits in these flavored e-cigs causing lung disease and exacerbations, thus, providing critical information for regulation of constituents of these ENDS.

Impact Analysis of Flavor Restrictions and Tobacco 21 Policies on Youth Tobacco Use

Sixteen states and the District of Columbia enacted state-wide tobacco 21 (T21) policies prior to passage of the federal T21 law in December 2019, and seven states have recently enacted bans on flavored tobacco products. The goal of this study is to examine the impact of state flavor restrictions and state and federal T21 policies on disparities in tobacco use among youth and young adults aged 14-24 years. Researchers will analyze data from two surveys: the Behavior Risk Factor Surveillance System (BRFSS), an annual national phone-based survey of health-related behaviors among adults aged 18+; and the Youth Risk Behavior Survey (YRBS), a biennial school-based survey of health-related behaviors in 44 states. Study aims are: (1) to evaluate the impact of flavor restrictions and T21 policies on tobacco use (cigarettes, ENDS, smokeless tobacco) across age (18-20 vs. 21-24) and examine the impact of both policies on tobacco use across socio-demographic strata, using BRFSS data; (2) to evaluate the impact of flavor restrictions and T21 policies on tobacco use (cigarettes, ENDS, smokeless tobacco, cigars) across age (14-17 vs. 18) and examine the impact of both policies on tobacco use across socio-demographic strata, using YRBS data; and (3) to examine the impact of Covid-19 state closures and re-openings on tobacco use overall, by age, and across sociodemographic strata, using data from both surveys. Findings may inform future regulatory activities related to youth and young adult tobacco use.

Countering E-cigarette Marketing in the Retail Environment among Adolescents and Young Adults

Many adolescents and young adults directly purchase e-cigarettes from brick-and mortar retail stores. The goal of this study is to identify appealing and influential characteristics of e-cigarette marketing in the retail environment that impact adolescent (ages 11-18) and young adult (ages 19-21) e-cigarette purchase and use. Study aims are: (1) to examine adolescent and young adult descriptions of e-cigarette marketing in the retail environment and its influence on their e-cigarette purchase and use behavior; (2) to identify the most appealing characteristics of e-cigarette retail marketing that influence purchase and use; and (3) to develop and evaluate the effectiveness of an e-cigarette counter-marketing lesson to reduce adolescents’ intent to use and actual use of e-cigarettes. To achieve Aim 1, researchers will conduct focus group discussions with adolescents and young adults who have either never used e-cigarettes or have ever used or currently use e-cigarettes; the study will include a separate focus group for youth peer advocates working on e-cigarette prevention (total participants = 72). To achieve Aim 2, researchers will survey 2,250 adolescents and young adults to identify how and which e-cigarette marketing characteristics influence e-cigarette purchase and use; the survey will include a discrete choice experiment. Aim 3 will involve a randomized controlled trial that will assign 950 adolescents to one of two conditions: (1) a newly-developed online counter-marketing lesson about e-cigarette marketing in the retail environment, or (2) an existing online e-cigarette overview lesson to assess influence on intent to use and actual use of e-cigarettes. Findings may inform future educational and regulatory activities related to e-cigarette retail marketing.

Personal Factors, Product Characteristics, and Changes in Biomarkers of Exposure among Cigarette Smokers Who Switch to Noncombustible Tobacco Products

The goal of this study is to evaluate the factors associated with transitioning from cigarettes to noncombustible tobacco products (e.g., smokeless tobacco, e-cigarettes) and assess the potential of noncombustibles as a harm reduction strategy. Researchers will evaluate four possible trajectories — continued smoking (least optimal outcome), complete cessation (most optimal outcome), exclusive noncombustible use (possible harm reduction) or dual/poly tobacco use (unlikely harm reduction) — through an analysis of Population Assessment of Tobacco and Health Study data. Study aims are: (1) to identify personal characteristics (e.g., sociodemographic characteristics, smoking history, harm perceptions, exposure to messaging) associated with switching from cigarettes to noncombustibles; (2) to describe product characteristics (e.g., cigarette characteristics, noncombustible characteristics such as flavor and nicotine content) associated with switching; and (3) to examine health outcomes and exposure biomarkers in smokers who have switched. Findings will provide new information related to switching from cigarettes to noncombustible tobacco products.

Modeling the Impact of Tobacco Regulations on US Future Trends of Chronic Obstructive Pulmonary Disease

The objective of this research project is to build a chronic obstructive pulmonary disease (COPD) model based on individual cigarette smoking histories that will be used to predict the long-term population impact of two FDA tobacco regulatory scenarios on COPD disease burden. Study aims are: (1) to analyze data from a database of US adults with COPD (the COPDGene Study) to determine the impact of smoking behavior changes on lung function decline and COPD mortality; (2) to develop a COPD simulation that estimates future COPD incidence, prevalence and COPD-associated respiratory and lung cancer deaths based on individual smoking histories; and (3) to predict possible future trends in COPD morbidity and mortality under two FDA tobacco regulatory scenarios: cigarette pack and advertisement graphic health warnings (implementation of a Final Rule) and a menthol cigarette ban (planned). Findings will provide new information about the impact of tobacco control policies on COPD trends.

CTP Supplement to Parent Grant: Impact of Flavor on Youth & Young Adults Use Intention, Abuse Liability and Perceptions of Cigarillos

The goal of this project supplement to the parent grant is to determine how the removal of flavors from cigarillos could impact co-use of cigarillos and cannabis, and whether that impact is related to perceptions of appeal or harm. Specific aims are: (1) to analyze parent study data on 361 young adult (ages 21-28) cigarillo users to determine the relationship between use of flavored cigarillos and co-use with cannabis (including blunts), and (2) to conduct one-on-one interviews with a subset of 38 participants to expand findings from the parent study, including understanding flavor appeal, perceived harm, and product substitution, and to assess these factors in the context of co-use with cannabis. Findings will provide new information about the influence of flavor on young adult co-use of cannabis and cigarillos.

Evaluation and Comparison of Impacts of Flavored Waterpipe Tobacco and Electronic Waterpipe E-Liquid Formulation Variations on Toxicant Yields and Particle Size Distribution in Mainstream Emissions

The popularity of flavored waterpipe (WP) smoking has expanded in recent years to flavored tobacco-free alternatives, including electronic WP (EWP). EWP replaces the traditional WP bowl and heat source with an electronic head filled with flavored, nicotine-containing liquid (e-liquid), turning the WP into an electronic nicotine delivery system (ENDS). The goal of this study is to compare the impact of variations in flavor profiles, humectants, sugar levels, and heating temperature in a variety of commercially available WP tobaccos and EWP e-liquids on hazardous and potentially hazardous constituents (HPHCs) and other toxicant yields as well as particle size distribution in mainstream WP emissions. Specific aims are: (1) to characterize variations in formulations of a variety of commercially available WP tobaccos and EWP e-liquids by determining the flavor profiles and humectant and sugar content; (2) to determine HPHC and other toxicant yields and particle size distribution in mainstream emissions generated by machine-smoking the WPTs using a research-grade electric heater operating at a high and low temperature; and (3) to determine HPHC and other toxicant yields and particle size distribution in mainstream emissions generated by machine smoking the e-liquids at a high and low EWP power setting. To achieve Aim 1, nine WP tobaccos and nine e-liquid flavors within popular flavor categories will be selected and chemically analyzed using established methods. To achieve Aim 2, WP tobaccos selected in Aim 1 will be machine-smoked using a human-derived smoking regimen; mainstream emissions will be analyzed for volatile and semivolatile HPHCs, particle size distribution, and other toxicants. The heater and tobacco temperature will be monitored and recorded. To achieve Aim 3, EWP e-liquids selected in Aim 1 will be machine-smoked as in Aim 2 but using an EWP head with variable power. Findings may inform future regulatory actions related to WP and EWP.

Survey of Risk Factors of Lithium Ion Batteries Used in ENDS

Electronic nicotine delivery system (ENDS) lithium-ion battery-related overheat, fire, and explosion (O/F/E) incidents have increased in recent years, but limited information is available about ENDS-related O/F/E risk factors. Efforts to understand causes of ENDS-related O/F/E incidents suggest that specific products and certain user practices may increase the risk of ENDS-related O/F/E incidents. The goals of this project are to collect data from a representative sample of 6,000 U.S. adult ENDS users via an online survey to identify user practices, ENDS devices, and batteries that may increase the risk of ENDS-related O/F/E incidents, and to estimate the prevalence of O/F/E incidents. Findings may inform future regulatory activities related to ENDS.

Multi-Parameter Investigation of Factors Controlling Carbonyl Emissions from Electronic Cigarettes

Carbonyl compounds, such as formaldehyde, a known human carcinogen, are among the hazardous and potentially hazardous constituents (HPHCs) found in e-cigarette aerosols. Researchers have reported numerous factors that influence e-cigarette carbonyl production (e.g., e-cigarette type, power, coil material, e-cigarette liquid (e-liquid) composition, topography), but differences in sampling methodology and testing protocols and a limited number of parameters investigated in individual studies have contributed to controversy regarding carbonyl levels in e-cigarette aerosols and the role individual factors play in their production. The goal of this study is to resolve some of the outstanding questions regarding e-cigarette carbonyl emissions by performing comprehensive testing of popular devices that are representative of three e-cigarette types (a cig-a-like, a sub-Ohm “mod”, and a “pod” type) under a variety of use patterns. Study aims are: (1) to test different carbonyl collection methods using a NIST-traceable formaldehyde standard and e-cigarette aerosols containing different amounts of liquid particulates, and select the best method for subsequent tests; (2) to investigate interactions between the main flavoring compound classes with e-cigarettes that have fresh and aged coils at different temperatures and e-liquid formulations; and (3) to investigate how different combinations of power, puff topography, and e-liquid viscosity affect carbonyl emissions of the e-cigarette types. Findings will help determine the optimal sampling methodology for carbonyls in e-cigarette aerosols and may inform future regulatory activities related to e-cigarettes.

Receipt and Use of Prohibited Free Samples of Tobacco Products Among Adult Cigarette, Cigar, and/or Smokeless Tobacco Users, 2020

On March 19, 2010, FDA finalized regulations restricting the distribution of free samples of cigarettes, roll-your-own cigarette products, and smokeless tobacco in the U.S. (excepting free samples of smokeless tobacco distributed in “qualified adult-only facilities”). This ban was extended to cover all tobacco products, including e-cigarettes and cigars, when the Deeming Rule went into effect on August 8, 2016. More information about tobacco product free samples distribution since the regulations went into effect would be useful. Using data from the National Panel of Tobacco Consumer Studies (TCS Panel), which includes approximately 4,000 U.S. adult current cigarette, cigar, and/or smokeless tobacco users, this study will report on free samples receipt and use behavior for cigarettes, cigars, smokeless, and e-cigarette products; locations where free samples are received; top brands received; and demographic and behavioral characteristics of recipients. If sample sizes are large enough, the following may also be examined: how and/or where tobacco users receive free samples, including vouchers to exchange for free samples; types of products and top brands received; how often tobacco users received free samples; whether recipients used the free samples; whether users of the free samples like and consider purchasing products that they received as free samples; and significant predictors or factors associated with receipt. Findings will provide new information on outcomes related to the tobacco free samples ban.

Predicting Effects of ENDS Flavor Regulations on Tobacco Behavior, Toxicity, and Abuse Liability among African American Menthol Smokers

More research would be useful regarding how electronic nicotine delivery system (ENDS) uptake affects tobacco use and associated toxicity among African American (AA) cigarette smokers, particularly those who smoke menthol cigarettes. The goal of this study is to evaluate how future ENDS flavor regulations may impact African American menthol smokers. The study will evaluate whether ENDS menthol flavor availability affects measures of tobacco use, biomarkers of cigarette/ENDS exposure, and addiction among AA menthol smokers (N=210, ages ≥21) by performing a six-week clinical trial of ENDS provision with follow-up to 30 days. Specific aims are: (1) to compare the effect of ENDS flavor availability on patterns of tobacco use behavior; (2) to quantify the effect of ENDS flavor availability on biomarkers of cigarette/ENDS exposure (expired air carbon monoxide, urine cotinine/NNAL, and urine propylene glycol; and (3) to test the effect of ENDS flavor availability on addiction/abuse liability using validated behavioral economic instruments at multiple time points during the trial. Researchers will provide subjects with JUUL devices with compatible cartridges at 5% nicotine and will randomize them to one of three groups that differ by potential FDA regulations related to ENDS flavor availability: (1) the current market where only menthol- and tobacco-flavored ENDS cartridges are available; (2) a market where only tobacco-flavored ENDS are available, and (3) a market where only unflavored cartridges are available. Study visits will occur weekly beginning one week prior to randomization with daily tobacco use monitoring throughout and biomarker/self-report data collection at each in-person visit. Study results may clarify the impact on AA menthol smokers of moving from the current regulatory market where menthol/tobacco-flavored ENDS cartridges are available, to one where only tobacco or unflavored cartridges are available.

The Effect of Sweet Flavoring on the Rewarding and Reinforcing Value of Cigarillo Use Among Young Adults

Data on the impact of sweet flavoring on combustible cigarillo use is important for understanding their health impact among young adults. The study aim is to determine whether the subjective rewarding value, the relative reinforcing value, and the absolute reinforcing value of sweet-flavored cigarillos are greater than that of non-flavored cigarillos among young adults. Researchers will investigate these aims in three separate laboratory visits among 86 young adults (ages 18-24 years) who have smoked at least 10 cigarillos in their lifetime. Participants will complete various validated scale measurements, a behavioral choice task, and an ad-libitum smoking procedure. Researchers will examine whether indices of abuse liability remain significant while controlling for other factors that may underlie the preference for flavoring. Results may inform future regulatory activities related to cigarillos.

The Effects of IQOS Use on Cigarette Smoking Behavior

In 2019, the Food and Drug Administration (FDA) authorized the sale of IQOS, and more data on the impact of IQOS use on cigarette smoking behaviors would be useful. This study addresses two aims: (1) to evaluate the effects of IQOS use on cigarette smoking behaviors; and (2) to examine which subjective and objective effects of IQOS predict cigarette smoking. Researchers will recruit 100 combustible cigarette smokers ages (18-65) to a 21-day study. Baseline smoking rate will be established during days 1-5. After overnight cigarette smoking abstinence, laboratory visits on days 6 and 7 will assess IQOS-associated craving relief, withdrawal relief, risk perceptions, subjective reward, and the reinforcing value of IQOS relative to combustible cigarettes. Participants will switch from cigarette smoking to IQOS use for the following 14 days (days 8-21). Participants will collect their spent cigarette filters and their used IQOS HeatSticks daily to enable researchers to assess consumption of cigarettes and tobacco sticks per day. The primary outcome is the daily count of cigarettes from baseline to day 21, and the secondary outcome is changes in motivation to quit smoking from baseline to day 21. Findings may inform future regulatory activities related to heated tobacco products.

The Impact of Cigarillo Warnings on Purchasing and Smoking Behaviors Among Young Adult Cigarillo Users

This study will assess the effectiveness of cigarillo warnings by extending previous research in which the researchers developed pictorial warnings for cigarillos. Study aims are: (1) to examine the impact of a pictorial cigarillo warning policy on young adult cigarillo smokers’ purchasing behaviors using a behavioral economics framework; and (2) to examine the impact of repeated exposure to pictorial versus text cigarillo warnings on cigarillo smoking intentions and behaviors. Participants will be young adult frequent cigarillo users ages 21-34. An estimated 1,282 subjects (635 Black/African American and 647 White) will complete an online shopping task using the Experimental Tobacco Marketplace; researchers will then examine the impact of different cigarillo warning manipulations (pictorial, FDA text-only, Surgeon General text-only) on cigarillo purchasing, cigarillo demand, and substitution of other tobacco products. Researchers will then recruit another sample of 600 young adult frequent cigarillo users (300 Black/African American and 300 White) to participate in a 6-week randomized control trial where they will be exposed to cigarillo warnings weekly to examine the impact of the warnings on intentions to continue cigarillo smoking and cigarillo smoking behaviors. Study results may reveal how to effectively communicate the risks of cigarillo smoking to young adults, including Black/African Americans, and may inform regulatory decision-making related to cigarillo warnings.

Exosomal Epigenetic Biomarkers Associated with Flavored Electronic Cigarette Use in Adults

More information about the health risks, especially long-term health risks, of flavored e-cigarette use would be useful. The goal of this study is to identify exosomal epigenetic biomarkers (including microRNAs and long non-coding RNAs) associated with flavored e-cigarettes. Study aims are: (1) to examine blood and urinary exosomal epigenetic biomarkers and associated biological pathways related to flavored (such as fruit-flavored) e-cigarette use; and (2) to evaluate within-subject alterations in exosomal epigenetic biomarkers and associated biological pathways during e-cigarette initiation and cessation. Researchers will analyze blood and urine specimens from the Population Assessment of Tobacco and Health (PATH) Study biorepositories. After identifying key biomarkers, researchers will expose them to primary human bronchial epithelial cells and small airway epithelial cells from non-smoker adults to determine their toxicity/inflammatory response. Findings may inform future regulatory activities related to flavored e-cigarettes.

Impact of E-Cigarette Characteristics and Marketing on Tobacco Use and Health: A Longitudinal Study Among U.S. Youth and Adults

More information about the impact of e-cigarette characteristics and marketing on tobacco use among youth and adults would be useful. Researchers will analyze longitudinal data (Waves 1-4) from the Population Assessment of Tobacco and Health (PATH) Study to accomplish three study aims: (1) to identify the impact of e-cigarette flavors (non-tobacco and non-menthol flavors vs. tobacco and menthol flavors) and types (open vs. closed system) on e-cigarette use among youth (12-17 years), young adults (18-34 years), and older adults (35 years and older); (2) to determine the impact of e-cigarette advertising exposure on e-cigarette initiation, use frequency, and susceptibility, as well as the mediating effect of harm and addiction perceptions; and (3) to identify the effect of e-cigarette use on cardiovascular, respiratory, and periodontal health, and compare the effects among different types of tobacco users (e.g., exclusive e-cigarette users, never cigarette smokers, exclusive e-cigarette users, former cigarette smokers, dual users, cigarette-only smokers). Findings may impact future regulatory activities related to e-cigarettes.

The Effects of Branded and Influencer Social Media Promotion of Flavored Tobacco Products (FTP) on FTP Use Among Youth and Young Adults

This study will examine the impact of exposure to social media marketing of flavored tobacco products (FTPs). Study aims are: (1) to identify and characterize social media message content related to FTPs by source (e.g., brand, influencer/community, regular consumer) and major themes (e.g., new-user targeting, health risks, flavor-type); (2) to examine the impact of exposure to commercial and influencer FTP content on product sales and on youth and young adult awareness, risk perceptions, intentions to use, initiation, and patterns of use of FTP products; and (3) to study whether/to what extent FTP regulatory policies modify the impact of exposure to social media content on FTP product sales and youth and young adult awareness, risk perceptions, intentions to use, initiation, and patterns of use of FTP products. These aims will be accomplished by analyzing social media data from Twitter and Instagram; individual-level data on exposure to tobacco marketing, tobacco attitudes, and tobacco use from the Population Assessment of Tobacco and Health (PATH) Study; FTP sales volume data from Nielsen store scanner data; and state/local FTP policy data collected by the National Opinion Research Center. Findings from this study may inform future regulatory activities related to social media marketing of FTPs.

Racial Disparities in Biomarkers, Tobacco Cessation, and Smoking Relapse in Association with Electronic Cigarette Use

Biomarkers can play an important role in assessing the potential health effects of tobacco products. However, evidence on the racial disparities related to biomarker outcomes of e-cigarette use is scarce. The goal of this study is to examine the racial disparities in biomarkers of exposure and toxicants in association with e-cigarette use by analyzing Population Assessment of Tobacco and Health (PATH) Wave 1-4 biomarker data. Study aims are: (1) to assess racial disparities in biomarkers of tobacco exposure and toxicants; and (2) to develop a bio-socio-psycho risk score in prediction of cessation, relapse, and health outcomes. To achieve Aim 1, researchers will link the biomarker data with the PATH adult surveys to identify the between-person and within-person differences in biomarkers by use of different vaping products, flavors, and transitions between e-cigarettes and combustible cigarettes across different waves. To achieve Aim 2, researchers will then use machine learning algorithms to develop a composite bio(biomarker)-socio(socio-demographics)-psycho(psychosocial factors) risk index score for each racial/ethnic group to predict subsequent abstinence from cigarette smoking and relapse to cigarette smoking. Study findings will provide new information related to racial disparities in e-cigarette health effects.

Electronic Cigarette Use During Pregnancy and the Impact on Newborn Metabolic Profile and Perinatal Health Outcomes

More information about the effects of e-cigarette use by pregnant women would be useful. The goal of this study is to evaluate the potential adverse effects of e-cigarettes on pregnant women and their developing fetuses. Specific study aims are: (1) to determine the pattern of women’s smoking from preconception to the perinatal period; (2) to determine the pattern of women’s smoking from 2016 to 2018; (3) to determine whether pregnancy e-cigarette use is associated with pregnancy, perinatal, and infant-related adverse outcomes; and (4) to determine whether pregnancy e-cigarette use is associated with an imbalanced metabolic profile in infants measured at birth. Researchers will conduct a surveillance study of women who had live births between 2016-2018 and participated in the Pregnancy Risk Assessment Monitoring System (PRAMS) survey. Data analyzed will include detailed smoking information, including conventional cigarette and e-cigarette use during preconception, third trimester of pregnancy, and post-delivery; researchers will also link PRAMS subjects from Tennessee and Iowa to newborn metabolic screening data to identify and validate metabolic profiles measured at birth that are associated with secondhand in utero e-cigarette and conventional cigarette exposure. Study findings may inform future regulatory activities that impact pregnant e-cigarette users.

Assessing the Impacts of the Four 2019/2020 US Federal-Level Tobacco Control Actions: Flavors, Youth Marketing, Youth Access, and Tobacco 21

Four key federal-level tobacco control actions were taken in the U.S. in December 2019/January 2020 to reduce electronic nicotine delivery system (ENDS)/tobacco use appeal and access, particularly among young people. These four actions were: (1) ENDS Flavors/Device Guidance, in which FDA prioritized enforcement against “any flavored, cartridge-based ENDS product (other than a tobacco- or menthol-flavored ENDS product),” (2) ENDS Marketing Guidance, in which FDA prioritized enforcement against “any ENDS product that is targeted to minors or whose marketing is likely to promote use of ENDS by minors,” (3) ENDS Access Guidance, in which FDA prioritized enforcement against “all other ENDS products for which the manufacturer has failed to take (or is failing to take) adequate measures to prevent minors’ access,” and (4) Federal T21, in which the federal minimum age of sale of tobacco products was raised from 18 to 21 years. Around the same time, two national public health events occurred that likely also contributed to population-level changes in ENDS/tobacco use behaviors: an outbreak of ENDS/vaping-associated lung injury (EVALI) was identified by CDC in August 2019, and the spread of a novel coronavirus in the US in January 2020 (COVID19). The shared historical timing of these actions and events requires innovative methods to assess the specific impacts of each federal action. Researchers will use a theoretically grounded mediational model to disentangle overall impacts into action-specific impacts. They will conduct secondary data analyses using the following sources: two complementary nationally-representative data sources, which each assess key measures of appeal and access and together include over 61,000 participants; the Population Assessment of Tobacco and Health (PATH) Study youth and adult surveys (2017-2021); and the U.S. arm of the International Tobacco Control (ITC) Project youth and adult surveys (2018-2021). Study findings will contribute to an understanding of the impacts of each action on Americans’ ENDS/tobacco use behaviors.

Testing the Effect of Anti-Tobacco Message Framing on Polytobacco Use in Lesbian, Gay, Bisexual, and Transgender Young Adults

Polytobacco use, defined as concurrent use of more than one tobacco product including electronic nicotine delivery systems (ENDS), is rising in lesbian, gay, bisexual, and transgender (LGBT) young adults. More information about how to effectively frame polytobacco risk communications for this population would be useful. The goal of this study is to test the effect of polytobacco message framing on risk perceptions and polytobacco use in LGBT young adults. Study aims are: (1) to identify polytobacco risk messages that effectively communicate absolute and relative risks to young adults; (2) to determine the effects of cultural targeting on LGBT young adult polytobacco users’ attention to messages and perceived effectiveness; (3a) to assess the feasibility of polytobacco risk messages developed in Aims 1 and 2 to LGBT young adults via text; and (3b) to estimate the effect sizes of exposure to messages on risk perceptions and tobacco use over time. Researchers will develop 48 messages and will conduct an online survey study with 2400 young adults (ages 18-35, estimated 50% LGBT) in which each participant will view and rate eight polytobacco education messages. Researchers will also conduct an in-laboratory study and focus groups (108 and 24-32 participants, respectively) and a Phase I randomized controlled trial (300 participants) to determine the message framing and targeting most effective for LGBT young adults. Findings may inform future tobacco education campaigns targeted to LGBT young adults.

Pharmacokinetic Bridging Study for the Inhalation of Nicotine in Saline in Male Sprague-Dawley Rats

Additional information on nicotine pharmacokinetics (PK) following inhalation will be useful in accurately predicting its PK across species (i.e., rodents, non-human primates, and humans). The CTP-NCTR InhaleCore Group has recently completed studies evaluating nicotine PK profiles in rats following a single dose administration by inhalation, oral gavage, and intravenous injection (E07607.01 and E07716.01). In these studies, the dose formulations for inhalation exposure consisted of nicotine in propylene glycol and water. Due to possible unknown inhalation toxicities of propylene glycol and its potential to impact the lungs, propylene glycol is probably not an appropriate vehicle for investigating nicotine inhalation toxicity in planned subacute and subchronic inhalation toxicology studies. In this study, the InhaleCore Group will assess the applicability of the previously collected PK data (nicotine in propylene glycol and water) to the PK profiles for new nicotine formulations (nicotine in saline) that will be used in the planned studies. Results from these studies will provide useful information for the development of physiologically-based pharmacokinetic (PBPK) modeling to characterize the PK of nicotine and its metabolites (cotinine and 3-hydroxycotinine) in rodents across different routes of exposure.

Uptake and Patterns of Use of the IQOS Heated Tobacco System by US Smokers

More information about the U.S. population health impact of IQOS, a heated tobacco system, would be useful. The goal of this project is to provide postmarket data evaluating the sociodemographic and tobacco use patterns of IQOS initiators, including the extent to which adult smokers are completely stopping use of all tobacco products, switching to exclusive IQOS use, dual-using cigarettes and IQOS, or rejecting IQOS and continuing smoking, as well as differing perceptions and use of IQOS by sociodemographic variables relevant to tobacco disparities. Study aims are: (1) to examine the sociodemographic and tobacco use characteristics, decision-making processes, and marketing exposure among adult initiators of IQOS; and (2) to examine the longitudinal determinants of long-term tobacco use outcomes among adult cigarette smokers who purchased and initiated use of IQOS. The study will involve an initial survey of 1000 adult (ages ≥18) IQOS initial purchasers and follow-up surveys of 600 cigarette smokers initially surveyed; follow-up will occur at 1 month, 6 months, and 12 months. A subsequent focus group study of 20 survey participants who had either switched to exclusive IQOS use or were dual-using IQOS and cigarettes will be conducted to obtain a deeper understanding of the quantitative findings. Findings will reveal important information about heated tobacco product use in the U.S.

Smoking Machine Adaptor Design Project for ENDS, Cigars, and Heated Tobacco Product

A single standardized smoking machine adaptor for cigars, ENDS, and heated tobacco products does not exist, making it difficult to accurately quantify the aerosol and smoke physical properties and hazardous and potentially hazardous constituent (HPHC) levels produced by these products. This design project has four aims: (1) to develop a single universal adaptor, or standardized family of adaptors, for the attachment of ENDS, cigars, and heated tobacco products to existing smoking machines originally designed for use with cigarettes; (2) to ensure that the adaptor(s) have high repeatability and reproducibility; (3) to coordinate and administer a study that tests repeatability and device validation while comparing the newly designed adaptor(s) to currently available adaptors; and (4) to provide tobacco product stakeholders with continued adaptor product support and improvement. A well-validated standardized smoking machine adaptor will ensure that accurate data are being used by stakeholders in their efforts to protect the public from tobacco-related death and disease.

Waterpipe Tobacco Additives and Their Effect on Human Puffing Behavior, Toxicant Exposures, Pulmonary Function and Appeal

Sweetened waterpipe (WP) tobacco may increase WP smoking appeal for first-time users; furthermore, high levels of sweet additives produce harmful and potentially harmful constituents (HPHCs) in WP smoke. The goal of this study is to define the effects of WP tobacco’s primary chemical additives with respect to sweet perception, appeal, toxicant exposure, addictiveness, harm and health risk perceptions, and lung function. Study aims are: (1) to characterize the HPHC and sugar content of four WP tobaccos (one brand prepared four different ways to vary glycerol and sugars); (2) to characterize the HPHC and sugar yields in mainstream smoke generated from machine smoking the four WP tobacco preparations using a research-grade waterpipe and a standardized WP puffing regimen; (3) to determine how WP tobacco content impacts puffing behaviors, a carbon monoxide biomarker, pulmonary function, nicotine uptake, and perceived sensory attributes and appeal of WP smoking, based on data gathered from 50 experienced WP smokers (ages 21-50) who will smoke the four different WP tobacco preparations in four different laboratory sessions; and (4) to determine the HPHC exposure ranges from the average puffing behaviors measured under Aim 2 for each WP tobacco preparation. Findings will provide new information about the impact of chemical additives in WP tobacco.

Understanding Uncontrolled Vaping Among Vulnerable Populations

E-cigarettes differ from combustible cigarettes in ways that may make it harder to control vaping. For example, e-cigarettes lack many of the same stopping cues as cigarettes, indoor bans are less common, and discreet use is easy. The goal of this study is to understand uncontrolled vaping and vaping restraint strategies. Study aims are: (1) to develop measures of uncontrolled vaping and restraint strategies; (2) to assess prevalence of and factors related to both uncontrolled vaping and restraint strategies; and (3) to establish the long-term impact of vaping restraint on uncontrolled vaping. To achieve Aim 1, researchers will conduct phone interviews with 8 adolescent (ages 13-17), 8 young adult (ages 18-25), and 8 adult (ages 26 and older) current e-cigarette users to understand how they describe uncontrolled use and vaping restraint and will then develop survey measures. To achieve Aim 2, researchers will survey 1,050 current e-cigarette users (300 adolescents, 300 young adults, and 450 adults) and evaluate the usefulness of the new measures. Researchers will then estimate uncontrolled use and vaping restraint strategies for the nation and examine whether these outcomes are more common among vulnerable populations, certain device type users, and dual users. To achieve Aim 3, researchers will conduct a follow-up online survey with approximately 700 e-cigarette users from the Aim 2 sample to examine how baseline vaping restraint related to uncontrolled vaping and smoking behavior one year later. Findings may inform regulatory activities related to e-cigarettes.

The Impact of Cigar Pack Quantity on Tobacco Use Behaviors

The goal of the proposed analyses is to clarify the relationship between cigar pack quantity and tobacco use behaviors. Study aims are: (1) to determine whether cigar pack quantity is associated with between- or within-person changes in cigar use and assess whether changes vary by sociodemographic characteristics (age, sex, race, ethnicity, income, and educational attainment); (2) to evaluate the impact of minimum cigar pack quantity laws on tobacco use and assess whether the impact of these laws varies by sociodemographic characteristics; (3) to evaluate the impact of minimum cigar pack quantity laws on cigar sales and assess whether the impact of these laws varies by county characteristics; and (4) to characterize differences in implementation and enforcement of minimum cigar pack quantity laws through qualitative interviews with key implementation personnel. The researcher will analyze data from national datasets, including the Population Assessment of Tobacco and Health (PATH) Study, the Tobacco Use Supplement to the Current Population Survey (TUS-CPS), the Youth Risk Behavior Surveillance System (YRBSS), and Nielsen retail scanner data. Study findings may inform future regulatory activities related to cigar pack quantity.

Designing and Evaluating Communication for Dual Users of E-cigarettes and Combustible Cigarettes

People who use both cigarettes and e-cigarettes (“dual users”) may not be adequately informed of their continued risk from smoking combustible cigarettes as well as the known harms of e-cigarettes. The goal of this project is to develop communication campaign messages for dual users that increase their knowledge of the high health risk of dual use and increase their intent to quit combustible cigarettes and ultimately e-cigarettes. Study aims are: (1) to develop effective campaign messages by investigating how dual users think about their identity, motivations for tobacco product use, and the barriers to quitting combustible cigarettes; (2) to determine whether campaign ads are more engaging if they focus on quitting combustible cigarettes only, sequentially quitting cigarettes and e-cigarettes, or simultaneously quitting cigarettes and e-cigarettes; and (3) to pilot test the effectiveness of texted campaign ads in changing real-world combustible cigarette and e-cigarette quit intention among dual users. To achieve Aim 1, the research team will conduct six focus groups (8-10 adult dual users ages 18+ per group) to better understand dual use and gather concepts for messages, draft 50-75 potential campaign messages for dual users to encourage them to quit, and conduct a national survey with 1,008 adult dual users to select the most promising campaign message themes. To achieve Aim 2, the team will create visual ads for the messages from Aim 1 and use an eye-tracking experiment to determine how the different conditions affect attention among dual users. To achieve Aim 3, the team will conduct a five-week experiment with 90 adult dual users randomized to receive the most effective ads from Aim 2 or control ads in order to determine subsequent quit intentions and behaviors. Study findings may inform the development of communication campaign messages specifically for dual cigarette and e-cigarette users.

Patterns of Use and Health Effects of “Premium Cigars” and Priority Research

Patterns of use can vary widely across cigar subtypes both by frequency of use and the population subgroups most likely to use them. Some research indicates that “premium” cigar smokers (versus smokers of other cigar subtypes) are significantly less likely to use cigars regularly (daily or monthly) or report current cigarette smoking. Still, all cigars pose serious negative health risks and premium cigars are used by youth and young adults. The goal of this study is to conduct an in-depth evaluation of the public health issues related to premium cigars (defined in this study as large cigars that contain tightly rolled tobacco wrapped in a tobacco leaf) as well as the health effects of premium cigars compared to other cigars and other tobacco products. This study will involve a comprehensive and systematic review and assessment of the scientific literature related to premium cigars. Topics evaluated will include patterns of use of premium cigars; how use patterns differ among cigar subtypes and other tobacco products and among different populations (types of tobacco users, age groups, and other demographics); and the short- and long-term health effects of premium cigar use. Findings may inform future regulatory activities related to premium cigars.

Chronic Hookah (Waterpipe) Smoking, Vascular Dysfunction, Inflammation and Oxidative Stress

The goal of this research is to clarify the long-term health effects of hookah (waterpipe) smoking on endothelial (artery lining) and vascular (blood vessel) function and identify biomarkers of harm that are associated with the effects of chronic hookah smoking on vascular health. Study aims are: (1) to evaluate the chronic effects of hookah smoking on peripheral endothelial function; (2) to study the chronic effects of hookah smoking on central artery stiffness; and (3) to evaluate the chronic effects of hookah smoking on biological markers of oxidative stress and inflammation. In 34 healthy chronic hookah smokers (ages 21-49 years) who never smoked cigarettes, matched for age and sex with 34 cigarette smokers and 34 non/never-smokers, researchers will measure: (a) endothelial function (measured by brachial artery flow-mediated dilation); and (b) vascular stiffness (measured by carotid-femoral pulse wave velocity and aortic augmentation index). Biological markers of inflammation (high sensitivity C-reactive protein, 8-iso-prostaglandin F2a, fibrinogen) and oxidative stress (pro-oxidant high density lipoprotein oxidant index and total antioxidant capacity) will be collected. Findings will provide new information about the chronic effects of hookah smoking and provide a foundation for future long-term studies of the effects of hookah smoking.

The Effect of Switching on or off Menthol Use on Cigarette Consumption, Dependence, Nicotine Exposure and Quitting Success

More information about menthol use among subpopulations would be useful. Researchers will analyze data from the adult (ages 18+) sample of cigarette smokers in Waves 1-4 of the Population Assessment of Tobacco and Health (PATH) Study using a technique called propensity score matching. They will study two groups of adult smokers: smokers who switched from menthol to non-menthol cigarettes and later attempted to quit smoking, and smokers who switched from non-menthol to menthol cigarettes and later attempted to quit smoking. Study aims are: (1) to compare quitting success between quit attempters who switched from menthol to non-menthol cigarettes and those who switched from non-menthol to menthol cigarettes; (2) to compare consumption, nicotine exposure, and dependence between adult smokers who did not successfully quit after either switching from menthol to non-menthol cigarettes or switching from non-menthol to menthol cigarettes; and (3) to assess whether race, sex or age modify the effect of switching from menthol to non-menthol cigarettes or from non-menthol to menthol cigarettes on 30-day cigarette abstinence, 12-month cigarette abstinence, consumption, dependence, and nicotine exposure. Study findings may inform future regulatory activities related to menthol.

Distinguishing Exposure to Secondhand and Thirdhand Tobacco Smoke and Electronic Cigarettes among U.S. Children Based on Multiple Biomarker Profiles

Currently, tobacco smoke exposure biomarkers that differentiate exposure to thirdhand smoke (THS) from exposure to secondhand smoke (SHS) or e-cigarette aerosol exposure are lacking. The goal of this project is to examine existing tobacco-specific and nonspecific biomarkers to assess children’s exposure to diverse tobacco/nicotine products. Researchers will analyze National Health and Nutrition Examination Survey (NHANES) 2013-2016 data to examine the prevalence and health risks of exposure to SHS and THS among children presumed to be unexposed to any tobacco smoke and among children exposed to e-cigarette aerosol only. This project has three study aims. Aim 1 is to compare tobacco-specific biomarkers of exposure (e.g., cotinine, total nicotine equivalents, tobacco-specific nitrosamines) with self-reported smoking and tobacco smoke exposure to categorize children into one of four groups: (a) mixed SHS and THS group (MEG): lives with nonsmokers or smokers of combustible products only, reported SHS; (b) THS group (TEG): lives with nonsmokers or smokers, no reported SHS; (c) e-cigarette group (ECG): lives with e-cigarette only users, reported e-cigarette aerosol exposure; and (d) no/minimal exposure group (NEG): lives with nonsmokers, no reported SHS. Aim 2 is to examine multiple tobacco-nonspecific (i.e., polyaromatic hydrocarbons, volatile organic compounds) and tobacco-specific biomarkers and biomarker ratios (e.g., NNAL/cotinine, 2-hydroxyfluorene/cotinine) to assess which combination of biomarker profiles further differentiates children by exposure type. Aim 3 is to examine the associations between exposure type and demographics, exposure-related symptoms, diagnoses, and healthcare utilization patterns in the MEG, TEG, and ECG compared with the NEG. Study findings will provide insight into the different health effects children experience depending on type of tobacco product exposure.

CTP Supplement to Parent Grant: Yale Center for the Study of Tobacco Product Use and Addiction: Flavors, Nicotine, and Other Constituents (YCSTP) (TCORS 2.0)

This supplement project will measure the effects of e-cigarette use and abstinence on the adolescent brain and behavior by testing biomarkers to assess short- and long-term e-cigarette effects. This project will add neuroimaging and neurocognitive testing to an existing clinical trial of an e-cigarette cessation intervention in adolescents (Yale’s Adolescent Brain Cognitive Development [ABCD] study); it will use ABCD neuroimaging and neurocognitive testing protocols to investigate how critical domains of function (i.e., reward processing, impulsivity and impulse control, working memory, emotion regulation) differ among adolescent e-cigarette users and change with abstinence. All youth in the trial (N=100; ages 13-20) will complete the ABCD neurocognitive battery, and 30 youth in the trial and 30 age/sex-matched controls will complete the ABCD neuroimaging protocol. Specific aims are: (1) to test for baseline brain and behavioral differences in critical domains of function between youth e-cigarette users and non-users; (2) to compare changes in brain and behavioral measures of critical domains of function between youth e-cigarette users and non-users; and (3) to test the relationship between changes in critical domains of function and e-cigarette abstinence among youth users. Findings will provide some of the first measures of the impact of e-cigarette use and abstinence on brain and behavior biomarkers of addiction among adolescents.

Center for the Study of Tobacco Products: Respiratory Effects of THC and Nicotine E-Cigarettes: A Prospective Study

E-cigarette/vaping-associated lung injury (EVALI) is a new disease that is not well-understood, in part because of the differences among e-cigarette devices and liquids used; however, it has been linked to tetrahydrocannabinol (THC) liquid use and vitamin E acetate inhalation. Importantly, computed tomography (CT) scans of the lungs of EVALI patients uniformly reveal “ground-glass opacities” (GGOs), which indicates partial displacement of air within the lung; the appearance of GGOs in e-cigarette users is a potential EVALI biomarker. Researchers at the Center for the Study of Tobacco Products (CSTP) will perform CT scans and pulmonary function tests and analyze the devices and liquids from healthy e-cigarette users aged 18-45 years. They will track participants’ respiratory health for two years and then conduct a second set of CTs and pulmonary function tests. Study aims are: (1) to perform CT scans and pulmonary function tests at baseline and after two years on 45 exclusive nicotine e-cigarette users, 45 exclusive THC e-cigarette users, and 45 nicotine+THC e-cigarette users, as well as an additional 45 non-e-cigarette users as controls; (2) to identify e-cigarette devices and analyze e-cigarette liquids used by each participant; and (3) to track respiratory health over two years using quarterly online surveys assessing respiratory and gastrointestinal symptoms. Study findings may provide more information about EVALI and may inform future regulatory activities related to e-cigarettes.

Pilot Study to Determine Health Effects of E-cigarettes in Healthy Young Adults

In this CTP supplement to a parent grant (Integrated Translational Health Research Institute of Virginia (iThriv): Using Data to Improve Health), researchers will conduct studies to assess early changes in human lungs due to e-cigarette use. This study will use a new magnetic resonance imaging technique called 3-dimensional hyperpolarized xenon-129 MRI. It is anticipated that this new MRI technique will help detect possible early changes in the lungs of healthy young people who use e-cigarettes. Study aims are: (1) to determine effects of e-cigarette use on healthy young adults (ages 21-30) who have never smoked cigarettes, and (2) to develop research methods to perform a larger clinical trial to determine whether e-cigarettes cause lung disease, and if so, what kind. To achieve the first aim, researchers will study ten e-cigarette users with normal lung function tests and ten healthy non-users. Researchers will perform MRI tests and collect exhaled breath, blood, and urine for testing. To achieve the second aim, researchers will develop study methods for performing MRIs at two locations, the University of Virginia and Duke University, in preparation for a multi-center clinical trial to conclusively determine if there are harmful health effects of e-cigarettes. Study results will provide new knowledge on the impact of e-cigarettes on human lung health.

Yale Center for the Study of Tobacco Product Use and Addiction: Flavors, Nicotine and Other Constituents

To reduce the risk of e-cigarette/vaping acute lung injury (EVALI), several states have banned flavored e-cigarette sales and one temporarily banned all vaping product sales. In this CTP supplement to a parent grant (Yale Center for the Study of Tobacco Product Use and Addiction), researchers will use new data from e-cigarette/vaping acute lung injury (EVALI) case reports by state and by month to estimate how smoking and vaping rates shifted in response to these policies as well as to the EVALI outbreak itself. Study aims are: (1) to clarify how state variation in behaviors and policies may have contributed to EVALI’s geographic distribution; (2) to quantify changes in vaping and smoking rates in response to the EVALI outbreak; and (3) to estimate how states’ policy responses to EVALI affected vaping and smoking. To address Aim 1, researchers will conduct analyses to characterize states’ 2019 EVALI prevalence by their pre-outbreak rates of vaping and marijuana use as well as marijuana legalization policies. To address Aim 2, researchers will analyze how adults’ smoking and vaping behavior shifted following changes in their state’s reported EVALI prevalence. To address Aim 3, researchers will estimate how banning flavored e-cigarette sales and all vaping product sales affected smoking and vaping rates (before and after policy implementation and compared to states that did not adopt policies). Study findings may inform state regulatory activities related to e-cigarettes.

Secondhand E-cigarette Exposure and Lung Function in Children

In this CTP Supplement to a parent grant about how lifetime environmental exposures impact health (the HERCULES Exposome Research Center), researchers will describe secondhand e-cigarette aerosol exposure and measures of lung function in children (ages 6-12) who reside with daily vapers. Study aims are: (1) to examine associations between secondhand e-cigarette aerosol chemical exposures and salivary metabolic profiles and pathways, and (2) to examine associations of secondhand e-cigarette chemical exposure and salivary metabolic profiles with markers of lung function. To achieve Aim 1, researchers will measure nicotine, benzene, and toluene exposure in 30 children of daily vapers and 30 children of non-vapers/non-smokers who will wear wristband air samplers for 120 hours (5 days). Researchers will collect saliva samples and analyze them to identify altered metabolic profiles and pathways; they will also examine associations of nicotine, benzene, and toluene with salivary metabolic profiles. To achieve Aim 2, researchers will examine associations between nicotine, benzene, and toluene exposure data and metabolomics data (from Aim 1) and lung function measures including fractional exhaled nitric oxide (FeNO), forced expiratory volume in one second (FEV1), forced vital capacity (FVC), mid-expiration forced expiratory flow rate (FEF 25-75%), and parent report of recurrent/chronic respiratory symptoms. Study findings may inform future regulatory activities related to e-cigarettes.

Understanding the Influence of E-cigarette Advertisement Features

The goal of this study is to examine the influence of four e-cigarette advertisement features (flavors, models, marketing claims, and price promotions) on young adult (ages 18-29) non-tobacco users who are susceptible to e-cigarette use. Study aims are: (1) to identify key features of e-cigarette advertisements that lead to greater attention; (2) to examine the associations between key features of e-cigarette advertisements and positive neurocognitive responses; and (3) to determine whether edited advertisements without key features lead to reduced positive e-cigarette perceptions and behavioral intentions compared to original advertisements. To address Aim 1, researchers will use eye-tracking technology to identify key e-cigarette advertisement features that receive attention (gaze duration and fixation frequency) in 70 young adults. To address Aim 2, researchers will use electroencephalogram (EEG) technology to evaluate the associations between key e-cigarette advertisement features and sustained cognitive processing and emotional arousal in 120 young adults. To address Aim 3, researchers will conduct a randomized comparative study among 900 young adults to determine whether an intervention group that receives e-cigarette advertisements without key features has lower levels of positive e-cigarette perceptions and behavioral intentions than a control group that receives original unaltered advertisements. Findings will provide information about the potential impact of specific e-cigarette advertising characteristics on the initiation and progression of e-cigarette use among young adults.

The Relationship Between Nicotine Metabolism and Nicotine Concentrations in E-cigarettes on Smoking Behavior and Toxicant Exposure in African American and White Smokers

African Americans are particularly vulnerable to smoking-related diseases and are less successful at smoking cessation. The goal of this study is to investigate the use of e-cigarettes for smoking reduction in African American and White smokers. Study aims are: (1) to investigate the impact of nicotine metabolism on nicotine pharmacokinetics and the subjective effects of nicotine concentrations in e-cigarettes, and (2) to elucidate the relationship between nicotine metabolism and nicotine concentrations in e-cigarettes and the impact on smoking behavior and toxicant exposure. To address Aim 1, 56 smokers (28 African American subjects and 28 White subjects ages 18 and older) will receive e-cigarettes with their preferred flavor (menthol or tobacco) and 10mg/ml and 50mg/ml of nicotine during two sessions (one concentration per session). To address Aim 2, one week after the completion of Aim 1, subjects will receive preferred-flavor e-cigarettes with 10mg/ml or 50mg/ml of nicotine to take home for two weeks. Outcomes (and associated race differences) for these study aims will include nicotine metabolite rate, plasma nicotine levels, carbon monoxide, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL), cigarette craving, nicotine withdrawal, nicotine dependence, cardiovascular and lung function, volatile organic compounds, self-reports of combustible tobacco product use, e-cigarette use, and amount of e-liquid used. Study findings will help elucidate the relationship between nicotine metabolism and e-cigarette nicotine concentration and its impact on smoking behavior and toxicant exposure in African American and White smokers.

Neuroimaging Approaches to Improve Prediction of Smoking Initiation and Nicotine Use Escalation Among Young Adult Electronic Nicotine Delivery Systems Users

The goal of this study is to identify neurobehavioral markers of nicotine use escalation and cigarette smoking initiation among young adult electronic nicotine delivery systems (ENDS) users. Study aims are: (1) to identify neural and behavioral markers of ENDS escalation and smoking initiation; (2) to determine whether neural markers add predictive utility beyond traditional measures; and (3) to determine the efficacy of public service announcements (PSAs) and identify neural predictors of PSA efficacy. At baseline, the researcher will measure traditional behavioral and novel brain responses using functional MRI in 180 non-smoking young adult (age 18-20) ENDS users to identify salient predictors of nicotine use escalation and smoking initiation; the researcher will quantify responses to smoking stimuli, vaping stimuli, and associated food stimuli in brain systems associated with cognitive control, emotion, and salience. Responses in the same brain networks will be assessed in response to existing tobacco control education PSAs and PSAs addressing ENDS flavors. Over the following six months, participants will receive weekly PSAs and bi-weekly PSA evaluations via emails and texts. In addition to evaluating the PSAs, participants will report all tobacco product use during the past two weeks. In-person visits at 3, 6, 9 and 12 months will include breath carbon monoxide and urine cotinine tests. Outcomes will include cigarettes smoked, exhaled carbon monoxide levels, urine cotinine levels, and ENDS and tobacco use outcomes. Study findings may inform future regulatory activities related to ENDS.

Novel Methods for Evaluating the Association of Electronic Cigarette Use with Cardiovascular Health

The goal of this study is to provide population-based evidence on the cardiovascular (CV) effects of e-cigarette use, including particular e-cigarette aerosol components that may be responsible for CV harm. Study aims are: (1) to examine the effects of e-cigarette use and cigarette/e-cigarette transitions on CV events; (2) to estimate associations of e-cigarette use with risk factors and preclinical biomarkers of CV injury, and to analyze biomarkers of exposure as potential mediators; and (3) to identify unique biomarker signatures of e-cigarette exposure and to associate clusters with preclinical biomarkers of CV injury. To achieve Aim 1, the researcher will use data from the Population Assessment of Tobacco and Health (PATH) Study Waves 1-4 (2013-2017) to investigate to what extent e-cigarette use is associated with CV events including myocardial infarction, stroke, and heart failure. To achieve Aim 2, the researcher will assess the effects of e-cigarette use on CV risk factors (blood pressure, triglycerides, and cholesterol) using data from the National Health and Nutrition Examination Survey (NHANES, 2013-2016) and on preclinical biomarkers of CV injury (inflammation, thrombosis, and oxidative stress) using data from PATH Wave 1 (2013-2014). To identify specific e-cigarette aerosol components that mediate CV risk, the researcher will analyze urinary exposure biomarkers for product constituents (nicotine, tobacco-specific nitrosamines [TSNAs], volatile organic compounds [VOCs], polycyclic aromatic hydrocarbons [PAHs], and metals). To achieve Aim 3, the researcher will use data from PATH Wave 1 to define clusters of e-cigarette use based on shared urinary exposure biomarker profiles related to use behaviors (frequency, other tobacco products, and reasons for use) and product characteristics (type and flavors), and associate each with preclinical biomarkers of CV injury. Study findings may inform regulatory activities related to e-cigarettes.

Development of Early Warning System for Toxins Related to EVALI and Vaping

In this CTP supplement to a parent grant (Co-Abuse of Cannabis and Tobacco), researchers will lay the foundation for developing an early warning system that identifies and evaluates emerging chemical threats posed by e-liquids that may lead to acute illnesses such as e-cigarette/vaping-associated acute lung injury (EVALI). The goal is to detect emerging trends in the composition of vaping liquids and would allow identification and evaluation of possible hazards before their use becomes widespread. Study aims are: (1) to mine social media data to identify emerging vaping products and potential hazardous constituents used in vape liquids; and (2) to analyze the aerosol properties and chemical composition of aerosolized vitamin E acetate (i.e., a chemical already suspected to be hazardous) and other potential hazardous constituents identified from social media monitoring in Aim 1 to determine their effects in lung tissue. Findings may inform future regulatory activities related to e-cigarettes.

Hispanic and Latino Youth and Tobacco Use: Foundational Research

The goal of this research effort is to guide CTP audience segmentation and communications strategies to inform evidence-based decisions about communications activities designed to prevent initiation of tobacco use among Hispanic/Latino youth and young adults. The research includes three tasks: (1) a comprehensive literature review and environmental scan, (2) secondary data analysis and audience segmentation, and (3) primary data collection among high-risk audiences. The scope and approach of the primary data collection will be informed by the first two phases and will include at least one round of qualitative data collection (e.g., focus group discussions) and may also include quantitative data collection/survey research; the number of subjects and age ranges have yet to be determined. This research will inform future CTP communications activities that are targeted toward Hispanic/Latino youth.

Respiratory Health and Cigar and Pipe Use in the NHLBI Pooled Cohorts Study

Cigarette smoking is the major risk factor for chronic lower respiratory disease (CLRD), which includes chronic obstructive pulmonary disease (COPD) and asthma. The goal of this study is to test whether cigar and pipe use is associated with accelerated lung function decline and CLRD-related hospitalizations and mortality. Researchers will analyze data from the National Heart, Lung, and Blood Institute (NHLBI) Pooled Cohorts Study, which collected lung function data (including spirometry exam data) from nine US general population-based cohorts that included 65,251 American Indian, Asian, Black, Hispanic and White adult men and women. Study aims are: (1) to harmonize self-reported interview questions on cigar and pipe use across the study cohorts in order to characterize cigar/pipe use; (2) to assess associations between cigar/pipe use and lung function changes over time, including rates of forced expiratory volume in one second (FEV1) decline, forced vital capacity (FVC) decline, FEV1/FVC, and airflow obstruction; and (3) to assess the association between cigar/pipe use and CLRD-related hospitalizations and mortality. Study findings may inform future regulatory activities related to cigar and pipe tobacco products.

Respiratory Effects of Exposure to Metals from Electronic Cigarettes (RE-EMIT)

Several metals, including lead and nickel, are known lung toxicants and have been found in e-cigarette aerosols. In this CTP supplement to a parent grant (The Exposure to Metals from E-Cigarettes (EMIT) Study), researchers will study how patterns of “pod” e-cigarette device use impact exposure to metals among young adults (ages 18-24) and how these metal exposures may be associated with pulmonary health effects. Study aims are: (1) to evaluate the contribution of pod devices to metal exposure; (2) to measure pod users’ pulmonary health outcomes and evaluate their association with pod use; and (3) to assess the role of metals in pod-related pulmonary health outcomes. To achieve Aim 1, researchers will assess metal concentrations in pod aerosol (collected from each participant’s device) and assess their association with use patterns (from a questionnaire) as well as established biomarkers of metal exposure in blood (lead, cadmium, manganese and zinc) and urine (nickel, arsenic, chromium, antimony, and tungsten); they will also measure chromium and arsenic in the aerosol. To achieve Aim 2, researchers will characterize differences in pulmonary outcomes between pod users and non-users at 0 and 6 months; among users, researchers will evaluate differences by age, sex, and pod type. To achieve Aim 3, researchers will assess the association of metals in pods and in biomarkers of exposure (e.g., urine nickel) with measures of lung effects by evaluating which patients fall below the lower limit of normal for pulmonary function tests. Researchers will add pulmonary outcome measures to 25 pod users and 25 control participants from the parent study, and will recruit an additional 25 pod users and 25 non-users (ages 18-24) to characterize pulmonary outcomes (reductions in the forced expiratory volume in one second (FEV1), forced vital capacity (FVC), and diffusing capacity of carbon monoxide (DLCO)), measures of metals in device aerosols, and measures of exposure to metals in urine and blood at 0 and 6 months. Study findings may inform future regulatory activities related to e-cigarettes.

Modeling Tyrosine Kinase Inhibitor-Induced Vascular Dysfunction Using Human iPSCs

Additional information about the pulmonary health effects of e-cigarettes would be useful, particularly given the growing number of e-cigarette or vaping use-associated lung injury (EVALI) cases. In this CTP Supplement to a parent grant (Modeling Tyrosine Kinase Inhibitor-Induced Vascular Dysfunction Using Human iPSCs), researchers will use a human induced pluripotent stem cell (iPSC)-based in vitro pulmonary toxicity screen to investigate the cellular, molecular, and genomic effects of six common e-cigarette components on lung tissue. Study aims are: (1) to generate iPSC-derived lung cells (i.e., alveolar epithelial cells, fibroblasts, smooth muscle cells, endothelial cells) from 12 existing healthy iPSC lines (6 male/6 female); and (2) to investigate the effects of e-cigarette components implicated in EVALI, including vitamin E acetate, tetrahydrocannabinol (THC), nicotine, propylene glycol, vegetable glycerin, and cannabidiol (CBD). Study findings may lead to new biomarkers and may inform future regulatory activities related to e-cigarettes.

Cigarette Smoking as a Risk Factor for Greater Psychiatric Symptom Severity Across Serious Mental Illnesses: A Secondary Analysis of Three Nationally-Representative NIH Datasets

People with serious mental illnesses (SMIs) such as bipolar disorder (BD), schizophrenia (SCZ), and major depressive disorder (MDD) comprise a population that is especially vulnerable to tobacco use; people with SMIs are twice as likely to smoke as people without SMIs. However, a federal tobacco education campaign targeted to the SMI subpopulation has not yet been developed. The goal of this study is to provide scientific evidence that could be used to develop such a campaign. Specific aims are: (1) to determine whether smoking is a risk factor for increased time in illness episodes (mood episodes in BD smokers; psychotic episodes in SCZ smokers; and depressive episodes in MDD smokers) in people with SMIs; (2) to determine whether smoking is a risk factor for increased time in depression across SMIs; and (3) to determine predictors of within-person changes in smoking behavior (initiating, quitting, relapsing). To achieve these aims, researchers will analyze data from three large National Institutes of Health datasets (BD: STEP-BD study, N=4361; SCZ: CATIE study, N=1460; and MDD: STAR*D study, N=2248). Study findings will provide scientific evidence that may be used to inform the development of a tobacco education campaign targeted to people with SMIs.

Predicting Longitudinal Patterns of Change in Adolescent Polytobacco Use: A Socio-Ecological Framework

More information about how patterns of single and polytobacco use change from early adolescence into emerging adulthood would be useful. The goal of this project is to examine patterns of change and associated predictive factors over an extended time period. Study aims are: (1) to examine trajectories and related predictors of single tobacco product use from early adolescence (age 12) to emerging adulthood (age 23); (2) to examine transitions into and out of polytobacco use classes, as well as predictors of these classes, from early adolescence (age 12) to emerging adulthood (age 23), and (3) to examine interactions among individual (e.g., motives for use, sensation seeking), interpersonal (e.g., parent modeling, rules), and contextual (e.g., geographic location) factors in predicting trajectories of single tobacco product use and transitions in polytobacco use. Researchers will analyze Population Assessment of Tobacco and Health (PATH) Study data (total of 52,731 respondents) from study waves 1 (2013-2014), 2 (2014-2015), 3 (2015-2016) and 4 (2016-2018) to examine the changes over time in use of tobacco products (cigarettes, cigars, waterpipes, smokeless tobacco, electronic cigarettes) individually and in combination. Study findings may inform regulatory activities related to youth and young adult use of tobacco products.

Measuring Anatalline and Nicotelline to Differentiate Non-combusted Tobacco Use Using the PATH Study

Biomarkers that can distinguish between types of tobacco product use can be used to help track associated health effects. The goal of this study is to measure nicotelline, a minor tobacco alkaloid associated with tobacco smoke particulate matter, in urine biospecimens gathered during Wave 1 of the Population Assessment of Tobacco and Health (PATH) Study. Previous research has shown that, when expressed as a ratio with its parent compound (anatalline), nicotelline may distinguish smokeless tobacco use from combusted tobacco use. Study Aim 1 will validate the anatalline/nicotelline ratio cut-points (as well as nicotelline in combination with other tobacco exposure biomarkers) that distinguish exclusive cigarette use, exclusive smokeless tobacco use, and dual smokeless plus cigarette use (140 adults each). In Study Aim 2, researchers will use the same participant groups defined in Study Aim 1 to explore whether nicotelline and ratios of nicotelline-to-traditional tobacco biomarkers (i.e., 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol [NNAL]) can differentiate e-cigarette use from exclusive cigarette use using data from exclusive e-cigarette users and dual e-cigarette plus cigarette users. Study findings may confirm nicotelline’s usefulness as a biomarker to discriminate among tobacco products and to identify patterns of polytobacco use.

Tobacco Use Trajectories and Disparities Among Sexual Minorities in U.S Adolescents and Adults

Sexual minority individuals comprise a population that is particularly vulnerable to tobacco use. The goal of this project is to analyze tobacco use across time in sexual minorities and resulting tobacco-related health disparities using Population Assessment of Tobacco and Health (PATH) Study data. Of PATH respondents with valid self-reported sexual identity (gay/lesbian, bisexual, something else, or straight) at all four study waves (N=26,696, ages 12+years), 2,520 reported sexual minority identity at one wave or more; 1,474 reported sexual minority identify at wave 1; and 905 reported sexual minority identity at all four waves. Study aims are: (1) to examine tobacco product initiation and use trajectories by sexual orientation and their associations with regular tobacco use and tobacco use disorder symptoms; (2) to identify tobacco use trajectories by sexual orientation and different associations with self-reported and biological health outcomes; and (3) to examine the role of biological and psychological stress on tobacco use trajectories, tobacco cessation, and tobacco-related health outcomes among adults and how these measures differ by sexual orientation. Researchers will assess tobacco use trajectories, including tobacco use initiation; progression in the number of products used, with a focus on e-cigarette use/non-use; and increase and decrease in use frequency. Aims 2 and 3 will involve analysis of survey self-report measures of stress (psychological distress) and health outcomes (respiratory illness, cancer, cardiovascular disease) alongside biological markers of stress (e.g. C-reactive protein, interleukin-6) and tobacco-specific markers linked to cancer risk (NNAL, NNN, TNE2). Researchers will also examine important moderators including age, sex, race and ethnicity throughout in all analyses. This project will provide new data that may inform regulatory activities to address the health burden of tobacco use among sexual minorities.

Do E-Cigarette Users Airways Have an Altered Lipid Content?

In this study, researchers will use previously-collected serum, saliva, sputum, and bronchoalveolar lavage fluid (BALF) from healthy never-smokers, tobacco smokers or vapers to determine whether the airways of e-cigarette users have an altered lipid (fat) content that may cause acute lung injury. Study aims are: (1) to determine the concentrations of lipid-associated surfactant proteins in samples of BALF, sputum and saliva from non-smokers, smokers and vapers; (2) to measure lung cell lipid content and stain alveolar macrophages (a type of white blood cell in the lung) with Oil Red O to look for altered lipid content in vapers’ alveolar macrophages and airway secretions; and (3) to study metabolites on samples of BALF, sputum and saliva from non-smokers, smokers and vapers. To achieve Aim 1, researchers will use western blotting techniques to determine the amounts of lipid-associated surfactant proteins in vapers’ airway secretions. To achieve Aim 2, researchers will use mass spectrometry as well as standard histological techniques to better understand the impact of lipid accumulation on vapers’ lungs. To achieve Aim 3, researchers will use mass spectrometry to determine levels of nicotine, cotinine, tetrahydrocannabinol (THC), and metabolites that are associated with lung injury in vapers’, non-smokers’, and smokers’ lungs. Findings may inform future regulatory activities related to e-cigarettes.

Do E-cigarette Design Features Impact Cigarette Initiation, Cessation & Relapse?

More information about how e-cigarette characteristics impact transitions to and from cigarette smoking would be useful. This project will evaluate the independent effects of four e-cigarette design features (flavors, device type, nicotine content, and nicotine formulation) on later cigarette smoking initiation, cessation, and relapse among youth (ages 12-17), young adults (ages 18-24) and adults (ages 25 and older) in the U.S. Researchers will analyze data from the Population Assessment of Tobacco and Health (PATH) Study, the U.S. arm of the International Tobacco Control (ITC) Youth Tobacco and E-cigarette Survey, and the U.S. arm of the ITC Four Country Smoking and Vaping Survey. Study aims are: (1) to examine e-cigarette use and cigarette initiation among non-smoking youth and young adults, particularly whether and how e-cigarette design features predict future cigarette smoking initiation, including progression to regular cigarette smoking; (2) to examine e-cigarette use and cigarette cessation among youth and adult cigarette smokers, specifically whether and how e-cigarette design features impact later cigarette smoking cessation, considering both the potential reach and effectiveness of design features; and (3) to examine e-cigarette use and cigarette relapse among adult former cigarette smokers, specifically whether and how e-cigarette design features impact later cigarette smoking relapse. These findings may inform FDA regulatory activities related to e-cigarettes.

Derivation of Lung Epithelia from iPS cells for Advanced Disease Modeling

The goal of this CTP supplement to a parent grant (which funds the study of alveolar epithelial type 2 cells [AEC2s], a type of lung cell) is to determine the effects of e-cigarette vapor exposure on the human alveolar epithelium (the internal surface area of the lung). Researchers will use newly-developed protocols to generate human AEC2s from induced pluripotent stem cells (iPSCs). They will culture the AEC2s using an air-liquid interface method and then expose them to (1) e-cigarette vapor containing nicotine, (2) e-cigarette vapor containing vitamin E-acetate (implicated in e-cigarette/vaping acute lung injury, or EVALI), (3) cigarette smoke, or (4) air (a control condition). Researchers will then measure the effects of these exposures on the RNA molecules, proteins, and metabolites in the AEC2s and generate a dataset. Study findings will describe e-cigarette vapor injury to this key lung cell type.

CTP Supplement to Parent Grant: The Role of Histone Deacetylase 9 in Vascular Calcification

In this CTP Supplement to a parent grant studying the role of histone deacetylase 9 (HDAC9, an essential regulator of vascular function), researchers will investigate whether toxic metals from vaping products prompt HDAC9-dependent dysregulation of vascular cell function and increased inflammation. Study aims are: (1) to analyze the heavy metal profiles of aerosol vapor generated by different open-system vaping devices, and (2) to determine the effects of toxic heavy metals in vaping aerosols and e-fluids on vascular cell function in vitro and cardiovascular and pulmonary function in vivo. To achieve Aim 1, researchers will use mass spectrometry to profile metals (by element and concentration) in aerosol vapor from six different open-system vaping devices (three refillable cartridges and three tank devices) and identify the origin (e-fluid, reservoir, heating coil) of each metal. To achieve Aim 2, researchers will use cell culture-based assays to determine how vaping aerosols, e-fluids, and metal constituents identified in Aim 1 affect gene and protein expression patterns and cellular function. They will also use wild-type and HDAC9-deficient mice to study the effects of chronic (1 month) vaping aerosol exposure on cardiovascular function (echocardiography), blood pressure, endothelial function, vascular reactivity, pulmonary function, and inflammation profile. Study findings may inform regulatory activities related to e-cigarettes.

A Mouse Model of Vaping Vitamin E Acetate: Effects on Lung Function and Pathology

In this CTP supplement to a parent grant (Effects of E-cigarette Exposure during Pregnancy on Offspring Lung Function and Disease: Characterization of Pulmonary, Intergenerational, and Epigenetic Effects), researchers will study the effects of inhaling vitamin E acetate (VEA) compared to aerosolized nicotine in propylene glycol/vegetable glycerol (PG/VG), which is linked to e-cigarette/vaping-associated lung injury (EVALI), on lung function and pathology in a mouse model. Study aims are: (1) to characterize the acute effects of vaping with increasing e-liquid percentage of VEA; and (2) to characterize the chronic effects of vaping VEA on lung function and pathology. To achieve Aim 1, researchers will expose mice that have not previously been exposed to vaping (naïve mice) and mice that have been exposed to house dust mite antigen (sensitized mice) or to aerosolized nicotine in PG/VG to increasing percentages (0, 10, 20, 40, or 80%) of VEA in PG/VG (1:1) e-liquid; researchers will determine VEA effects on pulse oximetry, bronchial lavage composition, and lung pathology compared to nicotine. At the optimal condition found to induce EVALI-like changes, researchers will determine the effects of modifying voltage. To achieve Aim 2, researchers will determine the chronic pulmonary effects of vaping (measured at 2 and 4 weeks) using a complete battery of pulmonary function tests, pulse oximetry, heart rate, bronchial lavage and lung pathology on naïve and sensitized mice. Study findings may inform the understanding of the link of pre-disposing factors, such as prior ENDS use, and pre-existing respiratory conditions, such as asthma, on the incidence of EVALI.

Impact of E-cigarette Prevention Messages on Adolescents

Additional research to inform effective communications related to e-cigarette prevention among adolescents would be useful. The goal of this project is to identify e-cigarette prevention messages that will reduce adolescents’ (ages 13-17) willingness to use e-cigarettes. Study aims are: (1) to identify promising ways to communicate with adolescents to prevent e-cigarette use; (2) to develop a set of e-cigarette prevention messages that discourage adolescents from wanting to use e-cigarettes; and (3) to evaluate whether prevention messages reduce at-risk adolescents’ willingness to use e-cigarettes and e-cigarette use behavior in a randomized controlled trial (RCT). To achieve Aim 1, researchers will: identify promising prevention message themes (e.g., health effects, social norms, addiction) targeted to adolescents based on the empirical literature; vet these themes with the study team, expert consultants, and a teen advisory panel; work with an advertising agency to develop creative concepts for the most prominent themes; and conduct six focus groups with about 60 adolescents to examine their responses to the creative concepts. To achieve Aim 2, researchers will: develop 10 e-cigarette prevention messages based on the chosen concepts from Aim 1; conduct 30 cognitive interviews with 10 tobacco-using, 10 tobacco-susceptible, and 10 non-susceptible non-user adolescents to refine the messages; and conduct an online study of 1,600 adolescents to examine the perceived effectiveness of the messages in discouraging e-cigarette use. To achieve Aim 3, researchers will select a set of the most promising messages from Aim 2 to test in an RCT with 506 adolescents who will receive daily text messages for 20 days; one group will receive one of the five e-cigarette prevention messages in a randomized order, while the other group will receive a control message such as “This study will help others in the future. Thanks for taking part!”. Researchers will examine the impact of messages on willingness to use e-cigarettes (primary outcome) and e-cigarette use, cognitive elaboration, negative affect, e-cigarette beliefs, and social interactions (secondary outcomes) with a brief daily assessment, 3 weekly surveys, and a survey at 3 months. Study findings may inform e-cigarette prevention messages and campaigns for adolescents.

Translational Studies on Electronic Cigarette-Derived Oxidants and Their Long-term Pulmonary Effects

Oxidative stress and damage resulting from exposure to oxidants such as free radicals and aldehydes play critical roles in the development and progression of most tobacco-caused diseases, including chronic obstructive pulmonary disease (COPD). The goal of this project is to evaluate toxicities caused by exposure to e-cigarette-derived free radicals and aldehydes and their role in the development of COPD. Study aims are: (1) to investigate the long-term pulmonary effects of e-cigarette exposure from products delivering high vs. low oxidant levels in a COPD mouse model; (2) to determine the impact of switching from cigarettes to e-cigarettes; and (3) to conduct a pilot single arm trial to determine the impact of switching from cigarettes to e-cigarettes on disease-related clinical symptoms and biomarkers of harm in smokers with preexisting COPD. To address Aim 1, researchers will conduct 3-month exposure studies to compare high vs. low oxidant e-cigarette products (Mod vs. Juul, respectively). To address Aim 2, researchers will pre-expose mice for 1.5 months to cigarette smoke prior to switching them to filtered air, e-cigarette aerosol, or 50/50 e-cigarette aerosol/cigarette smoke for the remaining 1.5 months to mimic the harm from “real world” e-cigarette use patterns in smokers (smoking cessation, switching to e-cigarettes, and dual use). The primary outcomes of Aims 1 and 2 will be development of a COPD phenotype (including changes in lung function and histology) and assessment of systemic and lung-specific biomarkers of oxidative stress/damage and inflammation. To address Aim 3, researchers will provide e-cigarettes to 30 smokers (ages 18-65) with mild/moderate COPD and ask them to use these products exclusively for a year; e-cigarette and cigarette usage will be monitored along with assessments of COPD-related clinical symptoms, spirometric lung function, and biomarkers of oxidative stress and inflammation. These studies will provide new information about the toxicological impact of oxidant exposure from specific e-cigarette devices.

Impact of Nicotine Messaging on Nicotine Beliefs and Tobacco Use Behavior

The public health impact of FDA’s proposed nicotine reduction policy hinges on the extent to which tobacco users and non-users understand the harms of nicotine in specific products (e.g., e-cigarettes, nicotine replacement therapy (NRT), reduced nicotine content (RNC) cigarettes) and how this understanding influences decisions made by non-users to try a product and by users regarding cessation, product switching, or continued use. Research has highlighted widespread public misperceptions of the health risks of nicotine. A brief nicotine corrective messaging intervention may correct misperceptions of nicotine, NRT, e-cigarettes, and RNC cigarettes. The goal of this study is to examine the effect of multiple exposures to a nicotine corrective messaging (NCM) intervention (compared to a delayed intervention control) on nicotine beliefs and intention/use of tobacco and nicotine products in U.S. adults (age 18 and older). Study aims are: (1) to test the impact of NCM on nicotine beliefs and the subsequent impact on intention and use of tobacco and nicotine products in a national sample of 715 adult smokers and non-smokers followed for 12 weeks; and (2) to test the impact of NCM (messaging vs. control) and nicotine content of study cigarettes (normal vs. reduced) on nicotine beliefs and subsequent use of tobacco and nicotine products using a 2 x 2 factorial design in a sample of 160 adult current smokers followed for 4 weeks (participants will be explicitly told which product they have been given). In both studies, participants will complete online surveys at scheduled intervals throughout the study period in which they will be exposed to up to six corrective messages and subsequently complete survey questions. Study findings will provide information about the potential of NCM communication efforts on tobacco use behavior in the general population and in adult smokers affected by a reduced nicotine content standard in combustible cigarettes.

Modified Use of E-Cigarettes and Marketing on YouTube

The goal of this study is to understand ways in which youth modify e-cigarettes, their motivations for doing so, and marketing sources. Study aims are: (1) to identify and characterize modified uses of e-cigarettes and associated marketing sources on youth-accessible YouTube videos, and (2) to examine modified uses and marketing exposure among an online sample of 500 adolescent (ages 13-17) and 500 young adult (ages 18-25) e-cigarette users. To address Aim 1, researchers will identify modified uses of e-cigarettes and marketing using fictitious youth YouTube viewer profiles to search for e-cigarettes using a browser plug-in and custom scripted web-crawling; then they will use machine-learning to automatically code the videos to identify e-cigarette modifications, motivations for modification, marketing sources, and appeal (number of views, number of likes). Subject matter experts in tobacco regulatory science, social media, youth tobacco use, toxicology, communications, and tobacco marketing will assess the potential impact of identified modified uses on e-cigarette appeal, addiction, and health effects. To address Aim 2, researchers will conduct an online survey with 1000 adolescent and young adult e-cigarette users to examine the prevalence, appeal, motivations, risk perceptions, and marketing exposure related to these modified uses and their predictors (i.e., demographic variables, past-month e-cigarette use frequency, e-cigarette dependence, other tobacco/substance use, interpersonal and intrapersonal risk factors). Findings may inform regulatory activities related to e-cigarettes.

Greenwashing Cigarettes: Perceptual and Behavioral Evidence of Inaccurate Modified Risk Advertising

“Greenwashing” is an increasingly common tobacco marketing strategy in which products are portrayed as eco-friendly and/or natural. Greenwashing tactics may inaccurately convey modified product risk to consumers. The goal of this project is to describe how cigarette companies use greenwashing to market their products and test the effect of these tactics on young adult (ages 18-29) risk perceptions in an online sample and actual smoking behavior in a controlled laboratory study. Study aims are: (1) to identify specific greenwashing tactics used in cigarette ads, determine their prevalence across brands and sub-brands, and determine changes in these tactics over time; (2) to test the extent to which the greenwashing tactics identified in Aim 1 contribute to inaccurate modified risk perception in 1,500 young adults using an online survey; and (3) to test the effect of greenwashing on behavioral economic demand and smoking topography in a laboratory-controlled cigarette self-administration study of 35 young adults. Findings will provide new information about the connection of greenwashing strategies to product risk perceptions and actual smoking behavior and may inform future regulatory activities.

Shrinking the Size of the Tobacco Powerwall and Restricting the Number of Tobacco Products Displayed to Reduce Adolescent Tobacco Use

The most prominent source of retail point-of-sale (POS) tobacco advertising comes from the tobacco power wall, the large, expansive display of hundreds of different tobacco products typically located behind the cashier in full view of consumers. Adolescents are frequent visitors to retail stores and thus are at significant risk for having repeated exposures to the tobacco power wall. The goal of this project is to experimentally evaluate the extent to which reducing the size of the tobacco power wall and the number of tobacco product units displayed influences tobacco use risk in adolescents. Study aims are: (1) to evaluate the extent to which reducing the size of the power wall and number of units of each tobacco product displayed on the power wall influences tobacco use risk; (2) to model the mediational pathways through which these reductions initiatives have their effects; and (3) to examine whether gender and/or tobacco use experience moderate adolescents’ reactions to the power wall regulatory options under investigation. This study will take place in the RAND StoreLab (RSL), a life-sized replica of a convenience store developed to evaluate how altering aspects of POS promotion influences tobacco use risk during simulated shopping experiences. A total of 750 adolescents (ages 11-20) will be randomly assigned to shop in the RSL under one of three conditions (250 per condition): (1) large power wall/ multiple product units displayed; (2) small power wall/multiple product units displayed; and (3) small power wall/single product units displayed. Researchers will consider the effect of these power wall alterations on risk of use of four classes of tobacco products: cigarettes, electronic nicotine delivery devices, cigarillos, and smokeless tobacco. Tobacco use risk will be indexed by: attention to the tobacco power wall, perceived tobacco use norms, perceived availability of tobacco products, and tobacco use intentions. Findings may inform future regulatory activities related to POS tobacco advertising.

Assessing Toxicant Properties and Health Effects of Cigarillo and Hookah Tobacco Aerosols in Rats

The goal of this project is to evaluate whether cigarillo and hookah tobacco aerosols exhibit differences in toxicants associated with five health outcomes (cancer, transcriptional reprogramming, lung function and inflammation, cardiovascular effects and serum circulatory inflammation) compared to cigarette smoke using a rat model. Study aims are: (1) to evaluate 14-day nose-only dose response exposures to aerosols generated from cigarettes, cigarillos, and hookah products; and (2) to evaluate the effect of these exposures on biomarkers of cardiopulmonary health effects. To address Aim 1, researchers will expose a total of 360 rats (10/sex/group) for one hour per day for 14 days to one of three exposure groups (250, 500, or 750 mg total particulate matter (TPM)/m3) and one of six tobacco products (two major consumer brands each of cigarettes, cigarillos, or hookah tobacco, selected based on their in vitro toxicant properties); an air exposure group of 20 rats will be included as a control group. The exposure atmosphere will be characterized for hazardous chemical substances including (but not limited to) carbon monoxide, tobacco-specific nitrosamines, nicotine, volatile carbonyls, and tar. To address Aim 2, researchers will use biospecimens collected following the exposures to assess and compare effects across the five health outcomes listed above. Researchers will obtain quantitative readouts of cardiopulmonary biomarkers to enable comparisons across products and to evaluate dose effects; biomarkers will include specific DNA adducts, lipid peroxidation, cytokine panels, global assessment of lung transcriptional reprogramming, gene expression changes in the heart and aorta, and gene expression changes predictive of circulatory inflammation. Findings may inform regulatory activities related to cigarillos and hookah tobacco.

Impact of Sugars on Tobacco Product Toxicity and Abuse Liability

Sugars are present naturally in some tobacco types and are also added to cigarette tobacco filler. Data suggest that sugars in tobacco filler may contribute to the harmful properties of cigarettes by enhancing smoke palatability and appeal and, as precursors to aldehydes and furans in smoke, by increasing smoke toxicity and carcinogenicity and potentially addictiveness. The goal of this study is to provide additional quantitative data on the relationship between tobacco sugar content and relevant toxicant yields in U.S. commercial cigarettes, and associated user exposures, behaviors, and cigarette appeal. Study aims are: (1) to characterize the impact of sugars in the filler of U.S. cigarettes on the chemical profile of cigarette smoke; (2) to investigate the impact of sugar content in cigarette tobacco on toxicant and carcinogen intake in U.S. smokers; and (3) to investigate the impact of sugar content in cigarette tobacco on cigarette abuse liability and appeal. To address Aim 1, researchers will add stable isotope-labeled sugars to a commercial cigarette that is low in sugars and will analyze the dose-dependent formation of corresponding pyrolysis products in the smoke of this cigarette; they will also analyze the impact of sugar content on the levels of nicotine and tobacco-specific nitrosamines (TSNAs) in the smoke. To address Aim 2, researchers will analyze sugars in U.S. commercial cigarettes and use Population Assessment of Tobacco and Heath (PATH) Study biomarker data to investigate the impact of sugar content in cigarette tobacco on toxicant and carcinogen intake in U.S. smokers. To address Aim 3, researchers will investigate the impact of sugar content on cigarette abuse liability and appeal by conducting a laboratory study in which 30 smokers (aged 18 and older) will assess study cigarettes with different sugar levels. Findings may inform future regulatory measures related to sugar levels in tobacco products.

Impact of a Reduced Nicotine Standard on Young Adult Appeal for Menthol and Non-Menthol Cigarettes

The goal of this study is to examine response to smoking menthol and non-menthol very low nicotine cigarettes (VLNCs) in 100 young adult (ages 18-24) menthol smokers. Study aims are: (1) to determine the influence of menthol flavoring on smoking reinforcement in the context of a reduced nicotine standard in the laboratory; (2) to determine the influence of menthol flavoring on smoking reinforcement in the context of a reduced nicotine standard in the natural environment; and (3) to examine the impact reinforcement on tobacco product purchasing. To achieve Aim 1, abstinent smokers (>12 hours) will attend three laboratory visits where they will smoke a cigarette. During Visit 1, smokers will smoke their usual brand cigarette ad libitum; researchers will measure subjective response (satisfaction, craving reduction, psychological reward, sensory effects like throat hit), smoking exposure (carbon monoxide [CO] boost), and behavior (number of puffs, puff volume). Next, after 7 days of usual brand smoking, participants will undergo two experimental conditions at home: (1) 7 days smoking menthol VLNCs; and (2) 7 days smoking non-menthol VLNCs. For each condition, participants will be instructed to switch their usual cigarette for the assigned research cigarette but may use other tobacco products. (Each experimental condition will be separated by a 7-day wash-out period.) On the last day of each condition, participants will smoke the assigned research cigarette in the laboratory, and researchers will collect data on subjective response, smoking exposure, and behavior to compare craving reduction, positive subjective response, and CO boost among menthol VLNCs, non-menthol VLNCs, and usual brand. To address Aim 2, during each 7-day period, participants will complete twice-daily assessments of cigarette and other tobacco use, withdrawal, and subjective response; data will allow researchers to compare cigarettes per day, craving reduction, and positive subjective response for menthol VLNCs, non-menthol VLNCs, and usual brand. To address Aim 3, in a fourth visit participants will complete two tasks in the laboratory to indicate the impact of menthol and nicotine content on cigarette purchasing behavior in the context of all tobacco products currently on the market. Findings will provide new information about the abuse liability of menthol VLNCs.

A Measurement Burst Study of Vaping in a National Sample of Young Adults

In this supplement to the Monitoring the Future (MTF) parent grant (Monitoring the Future: Drug Use and Lifestyles of American Youth), researchers will conduct a new longitudinal study of approximately 1100 individuals who participated in MTF as 12th graders in 2019 and will be modal age 19 in 2020, with an oversample of those who reported vaping and other substance use in high school. Approximately 570 respondents who report current vaping at age 19 will be invited to complete a one-time web-based survey (30 minutes) followed by 14 consecutive daily web-based surveys (5-7 minutes) to capture real-time fluctuation in vaping use patterns, consequences, and co-use with other substances. Study aims are to examine: (1) vaping frequency, products, devices, patterns, and contexts with daily data over two weeks, (2) signs of vaping addiction, craving, quit attempts, and physical consequences in real time, (3) co-use of vaping and other substances including alcohol, cigarettes, marijuana, and non-prescription drugs, and (4) recent exposure to nicotine through collection of biometric samples. Findings will provide new information about vaping behaviors and consequences among young adults that may inform future regulatory activities.

Identification of Free Radical Induced Biomarkers of Exposure to Electronic Cigarette Aerosol

E-cigarette aerosol contains highly reactive free radicals that can cause oxidative damage, which can contribute to the progression of cancers and other diseases. The goal of this study is to identify these free radicals and use their unique structures to develop an e-cigarette-specific biomarker of exposure. Study aims are: (1) to determine the structures of the free radicals produced by propylene glycol and glycerin in e-cigarettes; and (2) to determine the primary targets of radical adduct formation in the tissue of e-cigarette-exposed mice and identify metabolites formed from radical adducts in the serum. To address Aim 1, researchers will use free radical spin trapping, electron paramagnetic resonance spectroscopy techniques, and mass spectroscopy to identify and analyze the unique structural features of free radicals in e-cigarette aerosol produced from a popular temperature-controlled e-cigarette device. To address Aim 2, 120 mice will be exposed to e-cigarette aerosols and either pre- or post-exposed to 5,5-dimethyl-1-pyrroline noxide (DMPO) spin traps via nose-only exposures. Using an anti-DMPO antibody, the areas of free radical exposure will be observed in the pre-DMPO exposures and targets of radical damage will be observed in the post-DMPO exposures. Radical adducts formed in the post-DMPO exposures will be identified via mass spectroscopy and metabolites of these adducts will be identified in the serum to find viable e-cigarette-specific biomarkers of exposure. Findings may inform future regulatory activities related to e-cigarettes.

Cardiopulmonary Effects Induced by Electronic Cigarette and JUUL Aerosols in Both In Vivo and In Vitro Models

Although clinical evidence demonstrates declines in lung function and increases in heart attack risk in healthy dual-users of e-cigarettes and cigarettes, more evidence regarding the cardiopulmonary effects of chronic inhalation of electronic nicotine delivery system (ENDS) aerosols would be useful. The goal of this study is to evaluate how two ENDS products — open system e-cigarette devices and closed system JUUL-type devices — impact individual or combinations of aerosol constituents and their toxicity using innovative cell culture systems and mouse models. Study aims are: (1) to examine the roles that e-liquid constituents (i.e., propylene glycol/vegetable glycerin, flavors, nicotine) play in the chemical profiles and lung toxicity of ENDS aerosols using in vitro models; (2) to define a panel of biomarkers for cardiopulmonary effects following exposures to e-cigarette aerosols, JUUL aerosols, and dual use of cigarettes and e-cigarettes in juvenile mice; and (3) to compare pulmonary toxicity induced by e-cigarette or JUUL aerosols in mice. Findings may clarify the cardiopulmonary effects caused by prolonged use of ENDS and inform regulatory activities.

Yale Center for the Study of Tobacco Product Use and Addiction: Flavors, Nicotine and Other Constituents (YCSTP) (TCORS 2.0)

Systematic data collection can provide more information about e-cigarette or vaping product use-associated lung injury (EVALI), particularly regarding number of cases and specific products involved. In this supplement to the Yale University TCORS 2.0 parent grant, researchers will develop a robust surveillance system that will prospectively identify hospitalized patients with acute lung injury who vape or smoke. Study aims are: (1) to develop a robust surveillance system to prospectively identify admitted patients with acute lung injury who vape or smoke; (2) to perform toxicology analyses of e-liquids and device contents that are associated with EVALI; and (3) to build a biorepository of patient blood and urine samples among patients with acute lung injury who vape or smoke to investigate disease mechanisms. This project will enable research into disease mechanisms and elucidate risk factors associated with EVALI.

Center for the Study of Tobacco Products – Electronic Cigarette Use and Alveolar Macrophages: A Preliminary Study

Data from animal studies suggest that e-cigarette users may be at risk for a potentially debilitating condition called lipoid pneumonia. In this supplement to the Virginia Commonwealth University TCORS 2.0 parent grant, this supplement will collect pilot data relevant to the generalizability of lipoid pneumonia-related animal study data to humans. Study aims are: (1) to investigate lipid-laden macrophages in e-cigarette users, and (2) to characterize other disease biomarkers in e-cigarette users’ bronchoalveolar lavage (BAL) fluid. To address Aim 1, researchers will recruit 10 high-wattage (i.e., >20 W) e-cigarette users (ages 21-55) with over one year of experience exclusively using nicotine-containing e-cigarettes as well as an additional 10 never-e-cigarette-using, never-smoking controls. Using well-established methods, all 20 participants will undergo bronchoscopy and BAL to enable the collection of alveolar macrophages. Researchers will then compare the incidence of lipid-laden macrophages between groups. To satisfy Aim 2, researchers will determine the alveolar fluid composition differences in miRNA expression, extra-vesicle-miRNA, and microbiome profiles between the e-cigarette users and the control group. Findings may inform regulatory activities related to e-cigarette liquid constituents that have the potential to cause lung disease.

FDA CTP This is Our Watch Retailer Feedback Study

FDA’s Center for Tobacco Products (CTP) Office of Health Communication and Education has created and maintains retailer education materials, referred to as This Is Our Watch (TIOW), designed to give retailers the tools they need to comply with tobacco regulations. As a result of the Tobacco 21 legislation raising the federal minimum age for the sale of tobacco products from 18 to 21, FDA CTP is required to update TIOW retailer education materials. The goal of this study is to obtain feedback from retailers about their awareness, preferences and experiences related to the TIOW materials. Researchers will conduct 32 in-depth interviews (22 English, 10 Spanish) that will each last up to 60 minutes. Participants will include clerks, managers, and owners of tobacco retail establishments identified through government contacts, such as the State Synar Program managed by the Substance Abuse and Mental Health Services Administration (SAMHSA). Study aims are: (1) to identify T21 knowledge gaps and educational opportunities among tobacco retailers, and (2) to understand retailers’ sentiments, needs and challenges related to minimum legal purchase age compliance. Findings will allow FDA to understand what additional messages, information, and material format would complement the current TIOW education materials.

The Human Dose-Response Effects of Methyl Salicylate in Smokeless Tobacco

The goals of this project are to determine how changes in the methyl salicylate content of smokeless tobacco may affect HPHC exposure and nicotine pharmacokinetics (the body’s effects on nicotine), as well as to determine how changes in methyl salicylate content affect nicotine pharmacodynamics (nicotine’s effects on the body) and abuse liability. First, researchers will amend commercially available smokeless tobacco to create four investigational smokeless tobacco products (no methyl salicylate and low, medium, and high methyl salicylate content ranging from 0.3-30 mg/g). Next, researchers will administer each of the four products to 56 adult smokeless tobacco users (aged 21-65) under specific use conditions. Researchers will measure heart rate, blood pressure, pharmacokinetics, exposure to harmful and potentially harmfully constituents (HPHCs), and abuse liability (measures of liking, craving, and withdrawal) before and after product use. Findings may inform future regulatory activities related to smokeless tobacco products.

Study of E-Cigarette Aerosol Toxicity in In Vivo Nonclinical Models

Few peer-reviewed studies have compared the toxicity associated with inhaling aerosol from different types of e-cigarettes; therefore, a thorough comparison of the chemical constituent levels, pharmacokinetics (PK), and toxicity from different e-cigarettes would be informative for future toxicological assessments. Researchers will perform a 28-day study with PK assessment, a 90-day nose-only inhalation study with 45-day recovery groups, and a 6-month nose-only inhalation study; all studies will be conducted in male and female Sprague Dawley rats. The 28-day study will evaluate the toxicity of two e-cigarettes and will provide PK data (results will be used to inform dose selection in the 90-day and 6-month studies). The objective of the 90-day and 6-month studies is to perform longer-term comprehensive studies of four top-market-share e-cigarette products in the U.S. Researchers will gather data including e-liquid and aerosol concentration measurements; measurements in animals such as body weight and food/water consumption; clinical observations; and biomarkers of exposure. Findings will provide new information about the potential toxicological effects of e-cigarette use.

Smokers’ Decision-Making about Tobacco Use: The Interplay of Affective and Cognitive Factors with Product Characteristics

Misperceptions about the health risks and benefits of electronic nicotine delivery systems (ENDS) and heated tobacco products (HTP), as well as consumer dissatisfaction with product characteristics, may limit initiation and complete substitution for cigarettes. This project will investigate how price, indoor-air policies, and ENDS and HTP product characteristics (type/design, flavors, ability to reduce cravings to smoke) interact with risk/benefit perceptions to affect smokers’ decisions to reject ENDS, to substitute them for only a few cigarettes, to switch exclusively to ENDS, or to use ENDS to completely quit using tobacco products. Study aims are: (1) to examine how cognitive, affective, and contextual factors (e.g., whether products can be used where smoking is prohibited) moderate the influence of ENDS/HTP product characteristics on product choice and tobacco use patterns and trajectories; and (2) to examine how the effects of specific ENDS/HTP product characteristics on product use patterns are moderated by risk/benefit perceptions. Aim 1 will involve qualitative focus group interviews with 120 current and former adult smokers (aged 18+) and an intensive one-year (12 weekly, then 3 quarterly) assessment with 300 current smokers who recently initiated ENDS use to examine how ENDS/HTP product characteristics influence smokers’ decisions to initiate, dual use with, or substitute for combustible product use. Aim 2 involves two experiments and a randomized clinical trial. A discrete-choice experiment (DCE) will be embedded in a survey of 300 current adult smokers to examine the relative importance of ENDS/HTP product characteristics on risk/benefit perceptions, product preferences, and use intentions, and evaluate the predictive validity of these preferences on future tobacco use. A second DCE will examine the interaction of product characteristics, risk/benefit perceptions, and contextual factors on product preferences among 2,400 adult current smokers who currently, formerly, or never used ENDS/HTP products. These results will inform the design of a randomized clinical trial with 1,800 adult smokers involving a hypothetical purchase task that will manipulate risk/benefit perceptions of ENDS/HTP products to estimate the effect on smokers’ consumption of cigarettes, ENDS, and HTP, including the substitutability or complementarity of ENDS and HTP for each other and for cigarettes. Findings may inform regulatory activities related to cigarettes, ENDS and HTP products.

Assessing IQOS Marketing Influences and Consumer Behavior in Israel: Implications for the US

Developing an understanding of how heated tobacco products (HTPs) are marketed would be useful. IQOS, the global HTP leader, has a presence in several markets, including Israel. Israel is unique in that it represents three distinct regulatory contexts for IQOS: (1) during IQOS’s initial emergence in Israel, it was not categorized as a tobacco product (Dec 2016-Apr 2017); (2) IQOS was classified as a tobacco product in a relatively weak regulatory context (Apr 2017- December 2019); and (3) IQOS will be regulated as a tobacco product within new progressive legislation (study period starting January 2020). The goal of this study is to examine IQOS marketing strategies used in Israel during these three regulatory periods and assess their impact on segments of the Israeli and U.S. populations. Study aims are: (1) to examine IQOS marketing strategies in Israel from its emergence in the Israeli market and begin surveillance as IQOS is launched in the US; and (2) to examine market segments of Israeli and U.S. adults (users and nonusers aged 18-45) in relation to IQOS use and/or likelihood of future use. The researchers will study marketing content and consumer reactions in both Israel and the U.S. via examination of marketing channels (including point-of-sale audits), content analysis of advertising messaging strategies, interviews with IQOS retailers, online surveys of 1,000 Israeli and 1,000 U.S. adults, and interviews with 40 Israeli and 40 U.S. adults. Among the panel of Israeli and U.S. adults, the researchers will conduct market segmentation research on consumer characteristics; four specific market segments defined by the IQOS website will be examined: business and current events; art, culture and fashion; nature and hiking; and innovation and technology. By examining IQOS marketing strategies used in the three different regulatory periods in Israel and understanding the impact of these strategies on different consumer segments and the extent to which they generalize to U.S. consumers, findings will provide information to better estimate the potential impact of IQOS and its marketing in the U.S.

Assessing the Effects of Smokeless Tobacco Influencer Marketing in the Rapidly Changing Media Environment

Social media marketing remains an understudied area in tobacco control, particularly related to smokeless tobacco. The goal of this project is to examine the effects of exposure to smokeless tobacco-related social media content. Study aims are: (1) to conduct a content analysis to identify and characterize social media messages related to smokeless tobacco by source and major themes (e.g., new user targeting, health risks, flavors); (2) to assess the impact of social media content exposure on smokeless tobacco use, attitudes, harm perceptions, perceived prevalence of use, initiation, and use intentions) using data from the Truth Longitudinal Cohort Survey on Tobacco-Related Attitudes, Beliefs and Behavior (13,892 youth and young adults aged 15-21 at baseline [April 2014]); and (3) to study whether/to what extent tobacco control policies moderate the relationship between exposure to smokeless tobacco-related social media content and smokeless tobacco use. Investigators will apply various research and analytic methods to a unique combination of data sets, including social media data from Twitter, Instagram and Facebook and survey data on tobacco-related outcomes. Findings will provide policy-relevant scientific evidence on the impact of social media marketing of smokeless tobacco products.

The E-Cigarette Population Paradox: Testing Effects of Youth-Targeted Population Warnings for E-Cigarettes among Two Key Populations

Warnings on e-cigarette advertisements and packaging should communicate the risks of e-cigarettes to youth and non-smokers while also protecting perceptions of the potential benefits of switching completely to e-cigarettes among combustible cigarette smokers. The goal of this study is to identify effective e-cigarette ad warnings given this complex population paradox. Study aims are: (1) to develop and test a set of proposed warning messages to maximize desirable outcomes among both nonsmoking youth and adult smokers; (2) to evaluate e-cigarette ad warnings that maximize favorable effects on youth as the critical at-risk population; and (3) to test for unintended effects of e-cigarette ad warnings among adult cigarette smokers who may be discouraged from switching to e-cigarettes when exposed to some types of warnings. To address Aim 1, researchers will conduct a series of 16 focus groups (30 youth aged 14-18 and 30 adults aged 19+) to identify warnings that are likely to discourage non-smoking youth from using the product but do not discourage cigarette smokers from wanting to switch completely. To address Aim 2, researchers will use a mobile lab outfitted with computing and eye-tracking technology to test the effects of promising warnings from Aim 1 in a randomized experiment with 400 youth aged 14-18 to identify warnings that increase visual attention to the warnings, decrease attention to ad appeals, increase risk beliefs, and reduce use intentions. To address Aim 3, using the same mobile lab, researchers will randomize 400 adults aged 19+ to test whether the most effective warnings among youth that emerge in Aim 2 have any unintended consequences among adult smokers; specifically, they will test whether youth-effective warnings influence visual attention, comparative risks between combustible and e-cigarettes, and intentions to use both products (switching completely to e-cigarettes, dual use, or continued smoking of combustible cigarettes) among adults. Findings may inform regulatory activities related to e-cigarette ad warnings.

Advancing Perceived Message Effectiveness: A New Measure for Youth Prevention Media Campaigns

Among other tools, the FDA uses the perceived message effectiveness (PME) scale to select ads for The Real Cost campaign. However, this scale has some limitations, including: (1) it was developed with adult smokers; (2) it was developed before the advent of e-cigarettes and vaping; and (3) it assesses message PME (beliefs about the message; i.e., “This ad is informative”), while a growing body of literature suggests that effects PME (beliefs about the message’s impact; i.e., “This ad gives me good reasons not to smoke”) better predicts the impact of ads on intention and behavior change. The goals of this project are to develop and validate an effects PME scale for adolescent (aged 13-17) tobacco prevention and to compare the performance of this new scale to the FDA’s current message PME scale. Study aims are: (1) to develop a youth effects PME scale for vetting cigarette and e-cigarette prevention ads; (2) to establish whether effects and message PME prospectively predict the impact of smoking prevention ads on intentions to smoke cigarettes; and (3) to examine whether effects and message PME predict the impact of vaping prevention ads on intentions to vape. To achieve Aim 1, researchers will develop a youth effects PME scale for vetting cigarette and e-cigarette prevention ads. They will develop and refine an item pool, cognitively test items with 48 adolescents, and conduct a scale development study with a national sample of 800 adolescents. To achieve Aim 2, researchers will randomize 1,280 adolescents at risk of cigarette smoking to one of three The Real Cost cigarette prevention ad conditions or to a control ad condition; participants will view a set of ads each week and complete a final assessment at week 3, and the researchers will examine whether PME predicts the impact of ads on intentions to smoke, risk beliefs about smoking, and smoking behavior. To achieve Aim 3, researchers will randomize 1,024 adolescents to view three The Real Cost e-cigarette ads or to a control ad condition and examine whether PME predicts the impact of e-cigarette ads on intentions to vape and risk beliefs. Findings may help campaign designers select more effective ads, thereby increasing the impact of tobacco education campaigns targeted to youth.

Communicating about Nicotine and Differential Risks of Tobacco Products

The goal of this project is to study a communication strategy that combines messages about reduced nicotine in combusted cigarettes with messages about relative risks of other tobacco products (i.e., potential “modified risk claims”). Study aims are: (1) to develop preliminary messages about reduced nicotine in combusted tobacco products; (2) to quantify the relative importance of different types of information in communications about reduced nicotine; and (3) to test the impact of messages about reduced nicotine in combusted tobacco products in the context of potential modified risk statements for novel tobacco products in a randomized clinical trial. To achieve Aim 1, researchers will conduct focus groups with 36 adult (aged 18+) current exclusive smokers, 36 adult dual users of cigarettes and ENDS, 36 adult former smokers, and 36 young adult non-smokers (aged 18-29). To achieve Aim 2, researchers will assess the relative effects of various message attributes (e.g., specific numbers for reduction, mention of addiction and health effects, source) on affect, perceived risk, and intentions to quit (for smokers) or to try reduced nicotine cigarettes (for non-smokers) in a discrete choice experiment; participants will be adult current exclusive smokers, adult dual users, adult former smokers, and young adult non-smokers (450 from each group). To achieve Aim 3, researchers will conduct a randomized clinical trial with 900 adult current exclusive smokers, 450 adult dual users, and 450 young adult non-smokers to compare effects of reduced nicotine and potential modified risk messages (executed as full-color ads) alone and in combination; outcomes will include risk perceptions, affect, behavioral intentions and recall and behavioral outcomes. Findings may inform regulatory activities related to communication strategies involving low nicotine tobacco products.

Impact of Adding Tobacco Constituents Nornicotine and Anatabine on Self-Administered Nicotine

Because most electronic cigarettes contain nicotine, users may be at greater risk of transitioning to other tobacco products given the addictive nature of nicotine. More information about the interactions between nicotine and other tobacco constituent compounds in the context of this addictive risk would be useful. The objective of this research is to assess the impact of the addition of other tobacco constituent compounds to nicotine in an intravenous self-administration model in male and female adult and adolescent rats. Study aims are: (1) to assess the impact of adding nornicotine and anatabine to self-administered nicotine on the motivational value of nicotine in rats that began their nicotine consumption as adults; and (2) to assess the impact of adding those constituents to self-administered nicotine on the motivational value of nicotine in rats that began their nicotine consumption as adolescents. Findings on the impact of adding tobacco constituent compounds to ongoing nicotine self-administration may inform future regulatory activities.

The Role of Humectants and Flavor on Microbial Growth in Waterpipe Tobacco

More information regarding how additives like humectants and flavors alter microorganisms in waterpipe tobacco would be useful. The goal of this study is to assess the impact of humectants (humidifying ingredients) and flavor additives on microbial growth in waterpipe tobacco. Study aims are: (1) to evaluate the effect of flavor and humectant content on microbial growth in waterpipe tobacco; and (2) to assess the relationship between tobacco-specific nitrosamine (TSNA) production and microbial activity in waterpipe tobacco. To address Aim 1, researchers will use an unflavored, low-humectant commercially available waterpipe tobacco as a control and prepare it several different ways to determine the individual and cumulative effects of additives (glycerin, propylene glycol, and vanillin) on microbial growth; flavor and humectants will be added at quantities comparable to those in commercially available waterpipe tobacco. Researchers will quantify microbial composition using whole genome sequencing analysis, and will use shotgun proteomic analysis to characterize proteins expressed by organisms colonizing tobacco. To achieve Aim 2, two TSNAs (Nʹ-nitrosonornicotine [NNN] and 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone [NNK]) will be quantified in each tobacco preparation after 1 and 6 months of incubation and compared to levels found in the control. Study findings will provide new information about how humectants and flavors influence toxic exposures associated with waterpipe tobacco.

E-Cigarettes and Youth: Tests of Strategies to Prevent Recreational Use

Use of e-cigarettes by non-smoking youth has increased dramatically in recent years. The goal of this study is to test how variations in modified risk statements, novelty flavors, and flavor representation (pictorial images vs. plain-text flavor names) influence middle school youth (aged 11-14) e-cigarette perceptions and use susceptibility. Study aims are: (1) to determine how modified risk statements and the specificity of the health risks addressed by them influence middle school students’ perceptions of e-cigarettes and the FDA’s warning label; (2) to determine how flavor category influences middle school students’ perceptions of e-cigarettes and the FDA’s warning label; and (3) to determine how flavor representation influences middle school students’ perceptions of e-cigarettes and the FDA’s warning label. Two randomized experiments will be conducted on a sample of middle school students. The first, with 150 participants, will vary whether participants view a modified risk statement alongside the FDA warning on e-cigarette packages, as well as the type of modified risk statement (abstract health consequence vs. specific health consequence). The second experiment, with 550 participants, will vary whether participants view e-liquid vials with tobacco flavor or a novelty flavor (menthol, fruit, candy, goth). Outcome measures include risk perceptions, message comprehension, harm minimizing beliefs, susceptibility, and behavioral intentions toward e-cigarette uptake. Findings may inform communication strategies that minimize uptake of e-cigarettes by middle school youth.

Evaluating the Impact of Waterpipe Tobacco Marketing Claims on Young Adults

Specific evidence related to waterpipe tobacco packaging and marketing to identify claims and determine their influence on consumer harm misperceptions would be useful. The goal of this study is to document claims on waterpipe tobacco packaging and in digital marketing (websites and social media) and evaluate how such claims influence consumer perceptions and willingness to try waterpipe tobacco. Study aims are: (1) to identify waterpipe tobacco product packaging and digital marketing; (2) to analyze waterpipe tobacco product packaging and digital marketing to determine whether they contain health claims; and (3) to evaluate the impact of health claims on young adults’ willingness to try the product, product appeal, and perceptions of harm. To achieve Aim 1, researchers will we will select a random sample of 30 waterpipe tobacco manufacturers and purchase five flavors from each manufacturer to document claims made on product packaging (150 packages). Researchers will also randomly select 30 U.S. retailers (i.e., waterpipe cafés, bars, lounges). For each of the 30 manufacturers and 30 retailers identified, researchers will capture content from their websites, as well as capture the 20 most recent Instagram (n=1,200) and Facebook (n=1,200) posts. To achieve Aim 2, researchers will content analyze all the packaging and digital marketing content captured in Aim 1. They will then use an expert panel to determine whether claims found on packaging and in digital marketing are health claims. To achieve Aim 3, researchers will conduct a randomized online experiment with 1,500 young adults (aged 18-29), including waterpipe users or those susceptible to future use, to evaluate the impact of the health claims on willingness to try the product, perceptions of harm, and product appeal. Findings will provide new information about which claims consumers perceive as health claims and may inform related regulatory activities.

Analysis of ENDS Products

The goal of this project is to identify which of the 93 harmful and potentially harmful constituents (HPHCs) identified by the FDA are present in electronic nicotine delivery system (ENDS) products. Using validated testing methods, researchers will analyze ENDS e-liquids (33 e-liquids and four disposable devices containing e-liquid cartridges) and ENDS aerosols (aerosols of the 33 e-liquids produced from 21 different ENDS devices). In addition, researchers will provide relevant information (when available) about the products’ physical attributes and design characteristics, including e-liquid volume or weight, labelled nicotine concentration, power output, resistance, heating coil temperature, and battery capacity.

CTP Supplement to Parent Grant: Center for the Assessment of the Public Health Impact of Tobacco Regulations – Diversity Supplement for Project 3 (TCORS 2.0)

This is a supplement to an existing study titled “Modeling the Impact of Tobacco Control Policies on Polytobacco Use and Associated Health Disparities.” The aims of the supplemental research study are: (1) to evaluate the relationship between perceived discrimination and individual tobacco product use by race/ethnicity and gender; and (2) to evaluate the relationship between perceived discrimination and polytobacco use by race/ethnicity and gender. Using nationally representative data of adults aged 18 years and older, the study will examine the role of perceived discrimination on the use of cigarettes, cigars, pipe, smokeless tobacco, and e-cigarettes, individually and in combination. Importantly, differences by race/ethnicity (i.e., non-Hispanic White, non-Hispanic Black, Hispanic, and other races) and gender will be examined. Findings may lead to a better understanding of the complex interplay between social determinants and tobacco-related health disparities of polytobacco use among racial/ethnic minorities.

Modeling the Public Health Impact of a National Menthol Cigarette Ban

The goal of this project is to use microsimulation modeling to estimate the impact of a national menthol cigarette ban on tobacco use and tobacco-related disease, specifically cardiovascular disease (CVD) and tobacco-related cancers. Study aims are: (1) to identify trajectories of cigarette use over time among youth and adults using longitudinal, nationally representative survey data; (2) to conduct a review of studies examining the effects of a menthol cigarette ban on product use; and (3) to build a model of smoking and tobacco-related disease to estimate the impact of a national menthol cigarette ban on smoking, CVD, and tobacco-related cancers. To achieve Aim 1, the researcher will compute transition probabilities of tobacco use behavior (frequency, intensity, flavor preference) over time using Population Assessment on Tobacco and Health (PATH) Study data. To achieve Aim 2, the researcher will synthesize the literature on the impact of a menthol cigarette ban and conduct a meta-analysis to pool data from individual studies, generating critical information for simulation modeling. To achieve Aim 3, the researcher will build a microsimulation model of tobacco use and tobacco-related diseases, incorporate the effect of a national menthol cigarette ban on cigarette use, and estimate changes in smoking, CVD, and tobacco-related cancers that would occur in the total population and in specific socioeconomic and racial/ethnic groups if a ban were implemented. Findings may inform potential regulatory activities on menthol cigarettes.

Prospective Health Outcomes and Inflammatory Biomarkers Associated with e-Cigarette Use

The goal of this project is to identify validated biomarkers for use in the assessment of electronic nicotine delivery systems (ENDS). By analyzing data from two studies (the COPDGene and UCSD ENDS studies), researchers propose to identify ENDS-related inflammatory biomarkers in ENDS-only and dual (ENDS + cigarette) users and relate these biomarkers to five-year lung health outcomes. COPDGene is an ongoing longitudinal study of >6,000 current and former cigarette smokers; the study is identifying factors that increase chronic obstructive pulmonary disease (COPD) risk and includes detailed longitudinal lung phenotyping data (including chest computed tomography [CT]), genome-wide blood RNA-sequencing, and proteomic data. The UCSD ENDS Study is a study of young ENDS-only users and controls involving detailed assessment of inflammatory biomarkers in the oropharynx, airways and blood. Study aims are: (1) to identify and validate inflammatory transcriptomic and proteomic biomarkers of ENDS exposure in ENDS-only and dual users from the COPDGene five-year study visit; biomarkers will be validated in two independent sets of subjects from the COPDGene ten-year visit and the UCSD ENDS Study; (2) to identify antibody-specific adaptive immune response biomarkers of ENDS exposure in ENDS-only and dual users using adaptive immune receptor repertoire sequencing; and (3) to relate ENDS use and biomarker panels to five-year lung health outcomes using spirometry, chest CT, and questionnaire data from COPDGene. Findings may inform future regulatory activities related to ENDS.

Using PET to Measure Pulmonary Oxidative Stress in E-cigarette Users

Inducible nitric oxide synthase (iNOS) is an enzyme that is expressed in lung epithelium and causes inflammation, a common pathway for many types of lung disease. Researchers will measure lung inflammation using positron emission tomography (PET) imaging with [18F]-6-(1/2)(2-fluoro-propyl)-4-methylpyridin-2-amine ([18F]NOS), a new PET radiotracer that targets iNOS. The goal of the study is to use this technique to compare lung inflammation in adult (aged 18+) electronic nicotine delivery system (ENDS) users, cigarette smokers, and nonsmokers. Study aims are: (1) to quantify and localize the effects of ENDS use, cigarette smoking, and nonsmoking on lung inflammation, and (2) to examine the effect of ENDS use, cigarette smoking, and nonsmoking on biomarkers of airway and lung inflammation and lung function. To accomplish these aims, 60 subjects (three groups of 20: ENDS users, traditional cigarette smokers who report having smoked ≥10 cigarettes per day for the past year with no history of ENDS use or cannabis smoking, and nonsmoking controls) will complete self-report measures, undergo a one-hour [18F]NOS PET/CT (computed tomography) scan of the chest, provide a breath and blood sample for measurement of biomarkers of airway and lung inflammation, and complete lung function tests using spirometry. Researchers will compare biomarkers of airway (fractional exhaled nitric oxide (FeNO)) and lung inflammation (proinflammatory cytokines TNF-α, IL-1β, and IL-8) and lung function (forced expiratory volume (FEV), forced vital capacity (FVC)). Findings may inform regulatory activities related to ENDS.

The Impact of E-cigarette Marketing Features on Youths’ E-cigarette Perceptions and Use Intentions

The goal of this study is to determine the impact of branded e-cigarette marketing features – such as color, use of people in images, and language specifically targeting smokers – on e-cigarette perceptions and use intentions among youth. Study aims are: (1) to examine the e-cigarette marketing context surrounding youth over time; (2) to assess the impact of e-cigarette marketing features on youth’s e-cigarette perceptions and use intentions; and (3) to explore the impact of branded e-cigarette marketing features on youths’ attention using eye tracking. Studies will be conducted with non-current users of e-cigarettes who are aged 13-17. To achieve Aim 1, the researcher will conduct a longitudinal content analysis over five years, as well as yearly, of print, online, and point-of-sale marketing materials for five brands of e-cigarettes to monitor the potential for youth exposure and to identify e-cigarette marketing trends. To achieve Aim 2, the researcher will first conduct four online focus groups (each with 8-12 youth) to understand their perceptions about e-cigarettes and e-cigarette marketing; the researcher will then conduct an online survey experiment with 600 youth to test the effects of use of color, use of people in images, and language specifically targeting smokers on e-cigarette perceptions and use intentions. To achieve Aim 3, the researcher will use eye tracking technology to objectively measure attention (e.g., dwell time, gaze patterns) among 60 youth exposed to e-cigarette marketing materials. Findings may inform future regulatory activities related to e-cigarette marketing, packaging, and labeling.

CTP Supplement to Parent Grant: Graphic and Text-Based Waterpipe Warning Labels to Combat Harm Misperceptions

This study is a supplement to a parent study that investigated the impact of the placement of text-only or graphic-and-text health warning labels on waterpipes on smoking behavior and toxicant exposure. The supplemental study will investigate warning label placement and whether changes in participants’ waterpipe smoking behavior due to warning labels result in measurable changes in biomarkers of potential harm and puffing behavior. The parent study aims are: (1) to determine the optimal message and placement of the health warning label on a waterpipe to attract user attention; (2) determine the effect of the presence of the optimal text vs. text/graphic vs. no health warning label on a carbon monoxide biomarker, waterpipe puffing behavior, and other behaviors, including perceptions of risk as measured by the social interaction among participants during the waterpipe smoking session; and (3) to explore the impact of the presence of a health warning label (text vs. text/graphic) on smoking behavior at 3 and 6 months post-experiment. For Aim 1, researchers will determine the optimal placement of heath warning labels on different waterpipes using focus group methods (n = up to 36) and eye tracking research (n=72) in samples of young adults ages 18-29 years. For Aim 2, researchers will randomize 246 young adults (ages 21-29 years) to view text-only labels, text/graphic labels, or no health warning label on waterpipes that they smoke ad libitum in a controlled laboratory setting; outcomes will include waterpipe puffing topography measures; subjective ratings of nicotine dependence, craving, and liking/disliking; exhaled carbon monoxide; and conversation topics related to fear, health risks, and the health warning label. For Aim 3, researchers will measure changes in smoking behavior at 3 and 6 months after the experiment. The supplement will add spirometry and genotoxicity measures to the laboratory experiment and the 3-month assessment in order to study lung function and biomarkers of harm, respectively. This study will provide new information about waterpipe health warning labels that may inform regulatory activities.

A State-of-Art NMR Technique to Investigate Biologicals Effects of Electronic Nicotine Delivery Systems

More information regarding the molecular structures of electronic nicotine delivery system (ENDS) aerosols and their biological consequences would be useful. The goal of this study is to determine whether ENDS use at different temperatures alters aerosol constituents and/or molecular structure and toxicity by identifying and using metabolic signatures. Specific aims are: (1) to investigate the formation of ENDS aerosols at different temperatures using a magic angle spinning (MAS) technique, and (2) to apply a non-destructive slow-MAS nuclear magnetic resonance (NMR) metabolomics platform to define the dynamic response of lung organotypic cultures to ENDS aerosols. To address Aim 1, researchers will use their recently developed in situ MAS technique, which generates high resolution NMR spectra on samples containing a mixture of gases, liquids, and solids at significantly elevated temperature and pressure. To address Aim 2, researchers will use their lung organotypic culture platform, which enables the investigation of single cell populations (e.g., normal vs. cancer cells) as well as mixed cell populations (e.g., normal/cancer cell co-cultures) to define the baseline metabolome of normal human lung epithelial cells, lung cancer cells, and their mixture as cultures, as well as changes induced by ENDS aerosols generated at different temperatures. Findings may inform regulatory activities related to ENDS.

Early Phase Pharmacokinetic Analysis of Nicotine in Sprague-Dawley Rats

Nicotine is a naturally occurring alkaloid that is found in many nightshade plants, with most human exposure occurring through exposure to tobacco. The CTP-NCTR InhaleCore Group has recently completed studies evaluating nicotine pharmacokinetics (PK) profiles in rats following a single dose administration by inhalation, oral gavage, and intravenous injection (E07607.01). In these studies, the dose formulations for inhalation exposure consisted of nicotine in propylene glycol and water. PK samples were collected at 10 different timepoints ranging from 3 minutes to 48 hours post-dose exposure. Early PK timepoints (< 15 minutes post-dose) were collected using venous blood via the tail vein (i.e., peripheral source), whereas later PK timepoints were collected using arterial blood via terminal cardiac puncture (i.e., systemic source). For the venous blood to reflect the PK sample of the arterial blood, a minimum of 15 minutes is needed post-dose exposure. In this study, early PK timepoints will be collected using arterial blood via cardiac puncture to obtain a more accurate assessment of nicotine levels post-dose exposure. Two timepoints (5 and 10 minutes) to replace the timepoints from the previous study data collection via the tail vein and one additional 30-minute timepoint will be included, to provide an overlapping datapoint with the previous study data collection via cardiac puncture. Results will provide useful information to characterize nicotine kinetics across different routes of exposure, which is critical for the development of the physiologically-based PK model for nicotine and its metabolites (cotinine and 3-hydroxycotinine) in rodents across different routes of exposure. This scientific data may be used to identify and assess potential public health concerns related to nicotine inhalation exposure and may inform potential nicotine product standards.

Little Cigar and Cigarillo Warnings to Reduce Tobacco-Related Cancers and Disease

Few studies have examined the effectiveness of currently mandated little cigar and cigarillo (LCC) warnings. The goal of this study is to clarify which LCC warning characteristics (i.e., content, format, size) are most influential in reducing LCC use and how an additional LCC policy, the removal of flavor descriptors on packaging, could influence LCC warning impact. Study aims are: (1) to develop a comprehensive set of effective LCC warning statements and images; (2) to determine whether effective LCC warnings increase LCC quit intentions; and (3) to determine how removal of LCC flavor descriptors on packaging further impacts attention and affective responses to LCC warnings. To address Aim 1, researchers will use existing research and expert review to develop new LCC warnings (text plus images) and test them using online experiments with 500 adult (aged 18-65) LCC users to identify warnings that subjects perceive to be the most effective. To address Aim 2, researchers will conduct a national, web-based randomized controlled trial with 900 adult LCC users to examine whether the most effective warnings identified in Aim 1 encourage quitting compared to the currently mandated warnings and a control condition. To address Aim 3, researchers will conduct an in-person laboratory study with 100 adult LCC users using objective measures of attention (eye tracking), affect (facial electromyography), and arousal (electrodermal activity) to determine how flavor descriptors influence the effectiveness of new warnings compared to currently mandated warnings. Findings may inform regulatory activities related to LCC warnings.

Using Social Media for Tobacco Regulatory Intelligence

This research involves two projects that will use artificial intelligence (Al) methods to analyze social media posts and comments. Researchers will apply Al models to messages collected from Twitter and Reddit; these models will enable the timely identification, organization, and analysis of millions of social media posts and comments. Separate models will be developed for Twitter and Reddit, which will allow researchers to compare and contrast findings from the two social media platforms. Project 1 will detect and identify tobacco brands and products from a list of previously established brands and products. Project 2 will identify the mentions of tobacco product-related adverse events (e.g., burns from e-cigarettes, vaping lung illnesses) and the perceived health benefits and harms of tobacco products. Project findings will provide new information that may inform FDA regulatory activities and communications.

Understanding How Flavors and Nicotine are Used in Electronic Nicotine Delivery Systems Advertising (Phase 2)

This work represents an extension of earlier CERSI-funded analysis of the content of electronic nicotine delivery systems (ENDS) advertising. The goal of Phase 2 of this research is to understand how ENDS design features including flavors are presented in advertising content, as well as how nicotine and its concentration/volume/mass and type (nicotine or nicotine salts, for example) are depicted/communicated in ads. Researchers will purchase ENDS advertisements and their associated spend data (i.e., cost per ad) for 2018-2020 from a media tracking service. The sample will include ENDS ads from magazines (consumer and business-to-business), newspapers, radio, television, out-of-home (e.g., billboards, point-of-sale), and electronic media (e.g., direct-to-consumer emails, online displays, banner ads). Researchers will then content-code the ads for features, focusing on how flavors and nicotine are presented, including written and visual content; ads will also be coded for the prevalence and content of health warnings. Results across all ad years of the Phase 1 and Phase 2 study periods (2015-2020) will be combined. Researchers will analyze the depiction of flavor and nicotine content by advertisement medium over time, the depiction of flavor and nicotine content by medium audience, and marketing investments by manufacturer, brand, advertising medium, and products (including flavor and nicotine features). Researchers will also assess the presence and content of health warnings now required in ENDS advertisements. Findings of this study may be used to inform future regulatory activities related to ENDS marketing.

CTP Supplement to Parent Grant: Assessing the Intended and Unintended Consequences of E-cigarette TV Advertising

This proposed administrative supplement will build upon the parent project, titled “Assessing the Intended and Unintended Consequences of E-cigarette TV Advertising”, to leverage resources and infrastructure to investigate how a newly authorized heated tobacco product, IQOS, will be marketed in Atlanta, GA, the first test market for IQOS in the U.S. Study aims are: (1) to monitor and conduct surveillance of IQOS marketing in retail stores and public events in Atlanta, and IQOS marketing on social media, print media, and via direct mail/email; and (2) to analyze the content of IQOS marketing to determine whether it may target or appeal to tobacco disparity populations defined by gender, age, race/ethnicity, sexual orientation and socioeconomic status. Findings may inform regulatory activities related to heated tobacco products, particularly those related to youth and other priority populations.

CTP Supplement to Parent Grant: The Impact of Design Characteristics on the Modification Potential of Electronic Nicotine Delivery Systems

The goal of this project is to study early adopters of the IQOS heated tobacco product in Atlanta, Georgia by assessing their knowledge, risk perceptions, exposure to marketing, tobacco use history, and reasons for using IQOS; studying their IQOS use experience and behaviors, including dual or poly use with other tobacco products; and investigating their sociodemographics to understand the characteristics of early IQOS adopters. Study aims are: (1) to examine reasons for purchase, use intentions, risk/harm and benefit perceptions, knowledge about tobacco products, marketing exposure, tobacco use history, and sociodemographics among early adopters of IQOS in the greater Atlanta area, and (2) to conduct an in-depth examination of the IQOS retail experience, marketing exposure, and product use behaviors among IQOS early adopters, including experience with using IQOS, patterns of use, and dual or poly use with other tobacco products. To achieve Aim 1, researchers will conduct 400 intercept surveys within the first six months of product release among a convenience sample of adult (aged 18+) consumers who purchase IQOS at the IQOS store at Lenox Square and other Atlanta area retail stores that sell lQOS products. To achieve Aim 2, researchers will conduct six focus groups among IQOS early adopters (three among 20 young adults aged 18-29 and three among 20 adults aged 30+). Findings will provide information about early IQOS adopters.

CTP Supplement to Parent Grant: Evaluating Concomitant Use of Very Low Nicotine Content Cigarettes and E-cigarettes Among Daily and Non-Daily Smokers on Abuse Liability

In this supplement to an existing study titled “Evaluating Concomitant Use of Very Low Nicotine Content Cigarettes and E­cigarettes Among Daily and Non-Daily Smokers on Abuse Liability,” researchers will add a third arm to the study: one that exposes 80 adult daily cigarette smokers (aged 21 and older) to high and low nicotine dose JUUL e-cigarettes, along with very low nicotine content cigarettes (VLNCCs). Parent study aims are: (1) to characterize the effects of dual use of VLNCC and e-cigarettes on abuse liability, nicotine compensation, and product use, liking, and relative reinforcing efficacy among 80 adult daily smokers; (2) to characterize the effects of dual use of VLNCC and e-cigarettes on abuse liability, nicotine compensation, and product use, liking, and relative reinforcing efficacy among 80 adult intermittent smokers; and (3) to characterize the effects of dual product use on abuse liability as measured by retrospective measures, smartphone daily diary, and real-time measures captured via smartphone ecological momentary assessment. The study is obtaining information about the effects of dual use of VLNCCs and e-cigarettes with differing levels of nicotine on nicotine abuse liability, as measured by nicotine compensation, product use and liking, relative reinforcing efficacy, and assessments of withdrawal, craving, affect and satisfaction. In the parent study, smokers are provided with eGo-T e-cigarettes, which are second-generation devices; given the growth in market share of JUUL, researchers will add a third study arm that will use the same design and measures as existing study arms but will expose smokers to JUUL e-cigarettes rather than the eGo-T product. Findings may inform regulatory activities related to JUUL products.

Tobacco Longitudinal Mortality Study

The Tobacco Longitudinal Mortality Study (TLMS) will examine tobacco use and associated mortality in a large national sample of American households. Researchers will create a TUMS database using data from the Current Population Survey (CPS) Tobacco Use Supplements (TUS) (which includes 3 million individuals), the National Death Index (NDI), the Centers for Medicare and Medicaid Services (CMS), and other health agencies and researchers. Researchers will then link and analyze this data to estimate all-cause and cause-specific mortality outcomes including cardiovascular disease, stroke, heart attack, and respiratory disease (including chronic obstructive pulmonary disease (COPD)) associated with the use of cigarettes, cigars, pipes, hookah, and smokeless tobacco products. Finally, researchers will incorporate data from the National Cancer Institute to assess risks of lung, colorectal and breast cancer. Researchers will assess the mortality and cancer risk of common dual and poly-use patterns and may also examine the influence of tobacco cessation on total mortality, cause-specific mortality and cancer incidence. Findings will provide new information about the link between tobacco use and mortality.

Impact of Flavor on Youth & Young Adults use Intention, Abuse Liability and Perceptions of Cigarillos

The goal of this study is to examine the impact of characterizing flavors in cigarillos on product appeal, attention to marketing, product perceptions, abuse liability, and subsequent use behavior among youth (ages 14-20) and young adults (ages 21-28). Study aims are: (1) to evaluate perceptions of flavors on appeal, purchasing and risk perceptions of cigarillo products among young adult and adolescent cigarillo users; (2) to examine differences in visual attention and risk perceptions of flavored and unflavored cigarillo advertisements among young adult cigarillo users and nonusers; and (3) to evaluate, in an experimental tobacco marketplace, the abuse liability/addictive potential of flavored versus unflavored cigarillos while simultaneously evaluating the substitutability of flavored versus unflavored JUUL e-cigarettes. To achieve Aim 1, researchers will ask 392 youth and young adult cigarillo smokers to quantitatively rate the role of flavor and report perceptions of product appeal, health risk, advertising exposure and use intentions; participants will also complete purchase and substitution tasks. To achieve Aim 2, researchers will use eye tracking equipment to compare visual attention across a set of flavored only, unflavored only, or mixed advertisements for cigarillo products and JUUL in a randomized experiment involving 150 young adult and adolescent users and non-users; participants will provide absolute and relative risk perception ratings immediately and one week after advertisement exposure. To achieve Aim 3, researchers will randomly assign 162 young adult cigarillo users to one of four conditions in an experimental online store with different products available: (1) flavored cigarillos and fruit-flavored JUUL devices, (2) unflavored cigarillos and fruit-flavored JUUL devices, (3) flavored cigarillos and tobacco-flavored JUUL devices, or (4) unflavored cigarillos and tobacco-flavored JUUL devices; researchers will then evaluate purchasing behavior, price sensitivity, product substitutability, and motivation to quit. Findings may inform regulatory activities related to cigarillos.

Blood and Brain Based Biomarkers of Injury to Assess the Cerebrovascular Impact of Emerging Alternatives to Classic Cigarette Products

While traditional measures exist for assessing cardiovascular and respiratory health in response to the short- and long-term effects of tobacco smoking and, to a lesser extent, e-cigarette use, more data concerning the cerebrovascular toxicity of these products would be useful. The goals of this study are to investigate the impact of cigarette smoking vs. e-cigarette use on the brain microvascular environment; validate selected biomarkers associated with pro-thrombotic alteration of blood hemostasis (increased risk of stroke) and severity of post-ischemic brain injury in response to chronic exposure to tobacco smoking and/or e-cigarette use; and evaluate the relevance of selected biomarkers in assessing e-cigarette vs. tobacco smoking harm with respect to blood-brain barrier viability, neurovascular inflammation, onset of stroke, and stroke outcome. Study aims are: (1) to assess the cerebrovascular impact of e-cigarette vaping and JUULing vs. tobacco smoking in mice and develop potential biomarkers to determine harm/toxicity; and (2) to evaluate and validate the impact of chronic exposure to e-cigarettes and JUUL vs. tobacco smoking on the risk of stroke, secondary brain damage, and post-ischemic neurological impairments in mice. To address Aim 1, researchers will compare the harm/toxicity of vaping/JUULing vs. tobacco smoking on the blood-brain barrier and will evaluate potential biomarkers of harm. To address Aim 2, researchers will compare the impact of tobacco smoking and vaping/JUULing on brain vascular damage, focusing specifically on the impact on stroke risk and outcomes using brain and blood-based biomarkers specific to inflammation, hemostasis and antioxidative response that were evaluated in Aim 1. Findings may inform regulatory activities related to cigarettes, e-cigarettes, and JUUL.

Physical and Chemical Characterization of Aerosols Produced by Nicotine Salt Based E-Liquids

E-liquids containing nicotine salts of volatile organic acids can deliver nicotine more rapidly and efficiently than traditional free-base nicotine formulations. Manufacturers have incorporated this formulation into electronic nicotine delivery systems (ENDS) production, and nicotine salt-based products (led by JUUL) now have a major share of the U.S. ENDS market. More information regarding the chemical and physical characteristics of nicotine salt-based ENDS would be useful, specifically related to how nicotine salt aerosols differ from those produced by other nicotine formulations, which characteristics may influence nicotine delivery, and whether nicotine salt aerosols have a different profile of harmful and potentially harmful constituents (HPHCs). The goal of this project is to provide comparative data on the aerosol characteristics and HPHC profiles of nicotine salt and free-base nicotine ENDS. Researchers will develop and validate a set of analytical methods that will physically and chemically characterize nicotine salt e-liquids and the aerosols produced by both nicotine salt and free-base nicotine e-liquids. Findings will provide information about how nicotine formulation affects nicotine delivery and HPHC emissions.

Respiratory Effects of E-Cigarette Use Among Youth: A Prospective, Longitudinal Investigation

More information about the acute and chronic pulmonary and respiratory effects of e-cigarettes would be useful. The goal of this study is to investigate pulmonary functioning and respiratory effects among 150 youth aged 15-17 years, 100 of whom are exclusive-e-cigarette users and 50 of whom are never-users. Study aims are: (1) to compare changes over one year in pulmonary functioning and respiratory health between exclusive e-cigarette users and never-users in repeated laboratory sessions; and (2) to identify a dose-response relationship between quantity/frequency of e-cigarette use (via daily self-monitoring on a mobile phone app) and acute changes in pulmonary functioning (via same-day, home-based spirometry measurements). To achieve Aim 1, subjects will complete one baseline and four subsequent laboratory assessments over one year to provide a comprehensive assessment of respiratory health (e.g., airway reactivity, airway inflammation, pulmonary functioning). To achieve Aim 2, subjects will track their e-cigarette use by using a mobile phone app and take home-based spirometry measurements daily for four two-week periods (one prior to each laboratory assessment) so that the immediate acute effects of e-cigarette use on respiratory markers can be tracked. Findings may inform regulatory activities related to e-cigarettes.

Modeling the Impact of Flavor Bans Among Young Adult Tobacco Users Using Discrete Choice Experiments and Agent-Based Modeling

The goal of this study is to examine the impact of two flavor ban alternatives on young adults (aged 18-34) who are recent (past 30-day) users of tobacco products including electronic nicotine delivery systems (ENDS). Products studied will include menthol cigarettes; flavored cigars, cigarillos, and little cigars; and menthol and non-menthol flavored ENDS. Study aims are: (1) to assess product switching after implementation of a flavor ban and examine related determinants; (2) to estimate consumer response to hypothetical flavor bans using discrete choice experiments; and (3) to examine the impact of flavor ban policies using agent-based models. To address Aim 1, researchers will conduct an online survey among 600 young adult tobacco/ENDS users to assess product switching behavior after implementation of a flavor ban in San Francisco; researchers will evaluate flavor ban compliance enforcement, examine switching patterns, and analyze the determinants of changes in product use. To address Aim 2, researchers will conduct online discrete choice experiments with 600 young adults to estimate the impact of hypothetical flavor bans on product demand. They will examine multiple flavor ban policies related to menthol cigarette and flavored ENDS and will estimate the effects of product, flavor, price, nicotine content, and perceived harmfulness on smoker/user behavior. To address Aim 3, researchers will develop simulation models that capture the key determinants of switching behaviors and use the models to examine the impact of various flavor ban policies on switching behaviors as well as conversations between tobacco retailers and consumers. Researchers will also examine additional intervention strategies (price/tax policy, mass media campaign, smoking cessation program) that may work in concert with flavor ban policies. Findings will provide new information about the effects of tobacco product flavor bans on young adult use behavior.

Randomized Trial of Low Nicotine Cigarettes Plus Electronic Cigarettes in Smokers with a Mental Health Condition

Individuals with mental health conditions are particularly vulnerable to tobacco use. The goal of this project is to determine the likely health effects of use of very low nicotine content (VLNC) cigarettes, in conjunction with availability of nicotine-containing e-cigarettes, in adult smokers (aged 18-65) with mental health conditions. Study aims are: (1) to determine whether smokers with mental health conditions have lower levels of markers of harm (e.g. urine NNAL, carbon monoxide [CO]), measures of mental health, and cigarette addiction when switched to VLNC cigarettes for 16 weeks, as compared with normal nicotine content cigarettes (NNCs); (2) to determine whether smokers with mental health conditions have lower levels of markers of harm and cigarette addiction when provided with nicotine-containing (15mg/ml) versus zero nicotine e-cigarettes in order to switch to e-cigarettes or lower their cigarette consumption; and (3) to determine whether use of VLNCs increases the proportion of smokers who completely switch away from combustible tobacco use, as assessed four weeks after the end of the randomized phase of the trial. Researchers will randomize 240 smokers with mental health conditions to one of four groups: (1) NNCs (11mg nicotine/cigarette) and 15 mg/mL nicotine e-cigarettes; (2) NNCs and zero mg/mL nicotine e-cigarettes; (3) VLNCs (0.2 mg nicotine/cigarette) and 15mg/mL nicotine e-cigarettes; and (4) VLNCs and zero mg/mL nicotine e-cigarettes. Subjects will be followed for 16 weeks on study products and then another four weeks thereafter. At the end of the 16-week phase, participants will attend their last visit, receive encouragement to quit all tobacco products, and notified of community resources where they can receive smoking cessation counseling. Participants will be asked to provide information about their intentions for ongoing tobacco product use or cessation and will be followed for four weeks to assess these outcomes; those claiming to be no longer using combustible tobacco products will be visited to verify with a measure of exhaled CO. Study findings may inform regulatory activities related to VLNCs.

SmartVape: Real-Time Assessment of ECIG Device Characteristics using a Smartphone App

Most e-cigarettes use an electrically-powered heater to aerosolize a liquid that usually contains nicotine, a solvent (i.e., propylene glycol and/or vegetable glycerin), and flavorants. The power of the e-cigarette device, which is based on the device’s operating voltage and heater resistance, varies across devices and is a major determinant of how much nicotine and other toxicants are aerosolized. The goal of this study is to develop a tool to assess e-cigarette power objectively in real-world settings. Study aims are: (1) to standardize methods for e-cigarette and e-liquid image capture; (2) to develop the SmartVape app and supporting software; and (3) to test the app’s usability and data quality in real-world conditions. Researchers will develop a smartphone app (SmartVape) designed for e-cigarette users to capture images of their devices and e-liquid. On a back-end server, an operator will be able to compare these images to an image-based product registry with known data on device characteristics and e-liquid nicotine content. The result will be the ability to assess accurately the device used and the amount of liquids consumed over a discrete time period. With this information, researchers will be able to estimate nicotine intake from e-cigarettes more accurately in real-world settings. To address Aim 1, researchers will recruit 200 adult (aged 18+) e-cigarette users who will bring all of their e-cigarette devices and e-liquids to a laboratory, where the devices will be measured and photographed. To address Aim 2, researchers will develop the app and the image-based product registry. To address Aim 3, 50 adult e-cigarette users will use the app to record the devices and liquids they use over a 14-day period. The tool will provide a feasible and objective method for assessing e-cigarette device and e-liquid characteristics in surveillance research.

Correcting Public Misperceptions About Very Low Nicotine Content Cigarettes

In July 2017, FDA announced a comprehensive approach to tobacco and nicotine regulation that includes moving toward a very low nicotine content (VLNC) standard for cigarettes. The goal of this study is to reduce unintended consequences of a VLNC policy by developing campaign messages that address the common public misperception that VLNC cigarettes are safer to smoke than normal nicotine content cigarettes (a misperception that could potentially lead to lower quit rates). Study aims are: (1) to develop communication campaign messages that address the misperception that VLNC cigarettes are less likely to cause cancer than current cigarettes; and (2) to determine whether selected campaign messages reduce this misperception. Researchers will first develop 24 potential campaign messages and will obtain feedback from a panel of communication experts to refine the messages. Next, they will conduct an online experiment in 1,000 adult (ages 18 and older) smokers to identify the six most effective messages; conduct six focus groups, each with 8-10 adult smokers, to obtain feedback about the six messages; and work with the expert panel to select three messages for evaluation. They will then conduct an online experiment with a nationally representative sample of 1,096 adult smokers to understand the extent to which the three campaign messages reduce VLNC misperceptions and increase motivation to quit if a VLNC standard is enacted. Study findings may inform communication campaigns about VLNC cigarettes.

Investigation into Waterpipe Physical Design Parameters’ Effects on HPHC yields in Smoke and Charcoal Emissions (Phase II)

The goal of this project is to investigate the relationship between waterpipe physical parameters and harmful and potentially harmful constituent (HPHC) yields. Researchers will methodically isolate and alter individual waterpipe physical parameters (e.g., hose length; stem length, stem depth in water) and determine how these parameters affect yields of HPHCs such as quantities of aldehydes, metals, nicotine, tobacco-specific nitrosamines (TSNAs), and volatile organic compound (VOC) levels in waterpipe tobacco smoke. Phase II of this project seeks to determine how waterpipe dimensions affect waterpipe tobacco smoke chemistry and explores the need for a standardized testing waterpipe. Findings may provide new information about a standard waterpipe design for waterpipe tobacco product testing.

Impact of Flavors on Nicotine Perception and Self-Administration via E-cigarettes

Mechanisms by which flavors impact the initiation and maintenance of tobacco use are not well understood. Existing evidence suggests that flavors may enhance the appeal of and facilitate the development of addiction to tobacco products by influencing nicotine’s reinforcing or aversive actions. The goal of this study is to examine whether menthol and fruit flavors impact e-cigarette use through specific behavioral mechanisms and exert different effects across nicotine concentrations. Study aims are to assess the impacts of nicotine and flavor (and their interactions) on participants’ subjective ratings of different e-liquids and the cumulative amounts of self-administered e-liquids. Fifty young adults (ages 18-30 years) will be asked to attend four test sessions each. Each test session will consist of two components. During the first component, subjects will use five different e-cigarettes and will be directed to take two 4-second puffs at 15-second intervals for each e-cigarette, with a 5-minute break between each e-cigarette. Subjects will be asked to self-administer a total of 12 puffs of the e-cigarette across approximately half an hour. They will be asked to report subjective effects for each e-cigarette during the 5-minute breaks using the Drug Effects Questionnaire (DEQ). In the second component, subjects will be given access to the same five e-cigarettes and be allowed to use them as they choose for 45 minutes in total; researchers will track number of puffs. The sessions will be identical except that the e-liquids in the e-cigarettes will differ between sessions. The subjects will use 20 e-liquid types across the entire study (4 test sessions x 5 e-liquid conditions per session) and the e-liquids will vary by flavor (unflavored, menthol, menthol mint, green apple, watermelon) and nicotine level (0, 6, 12, 24 mg/ml nicotine). The order of flavors and nicotine levels will be randomly assigned to each subject and neither the subject nor the researcher will be told the order. This study will provide new information about the impact of flavors on e-cigarette use.

Impact of Cigar Flavor on Tobacco Use Behaviors and Addiction in Dual Users

The rapid increase in dual use of flavored little cigars/cigarillos (LCCs) with cigarettes among U.S. young adults has significant implications for their health, addiction, and cessation. The goal of this study is to determine the addiction potential of flavored and unflavored LCCs compared with cigarettes, and if addiction potential varies by flavor and sex, among young adult (ages 18-34) dual users. Study aims are: (1) to characterize the addiction potential of LCCs compared with cigarettes; (2) to determine the extent to which the addiction potential of LCCs varies by flavor and sex of user; and (3) to determine the extent to which flavoring affects LCC use in the natural environment. The study will be conducted over three weeks with 145 young adult dual users of cigarettes and LCCs. Participants will be asked to substitute preferred flavor LCCs for one week and unflavored LCCs for one week in place of their normal LCCs. The study will include survey-based measures and ecological momentary assessments (EMAs) of addiction potential, dependence, and tobacco use, and biomarkers of exposure (exhaled carbon monoxide and urinary cotinine). Addiction potential of cigarettes and LCCs will be characterized by behavioral economic indices of demand (such as hypothetical consumption at escalating prices) and other standardized measures to address Aims 1 and 2. Participants will record their tobacco use, craving, mood, and setting using EMA on their mobile phones to address Aim 3. This study will provide new information about LCCs that may inform regulatory activities.

Understanding the Association Between Electronic Cigarette Aerosol Emissions, Tobacco Product Characteristics and User Topography and Consumption Behavior

There is a lack of consensus regarding appropriate metrics for reporting e-cigarette emissions. The total particulate mass concentration, CTPM, of whole aerosol emissions is dependent upon both user topography behavior and e-cigarette/e-liquid product characteristics; the mass ratio of harmful and potentially harmful constituents (HPHC) (fHPHC) and nicotine (fNic) present in aerosol emissions are different functions of topography behavior and product characteristics. The researchers propose a theoretical framework that defines the product of the two terms as HPHC mass concentration: CHPHC [mg/mL] = fHPHC [mg/mg] x CTPM [mg/mL]; similarly, for nicotine, CNic [mg/mL] = fNic [mg/mg] x CTPM [mg/mL];. The goals of this study are to use this framework to develop a standardized test protocol for e-cigarettes and e-liquids, propose standardized emissions outcome measures, and inform the development of criteria to distinguish low- and high-dose ENDS. Study aims are: (1) to conduct screening studies of 24 e-cigarette products and 8 e-liquid compositions to inform the creation of a formal, standardized e-cigarette emissions test protocol; (2) to evaluate total particulate mass concentration as a function of product characteristics and user topography behavior; and (3) to evaluate HPHC and nicotine mass ratio of emissions present in whole aerosol as a function of product characteristics and user behavior characteristics. Findings may inform standardized testing processes for e-cigarette emissions.

Differences in Inflammation, Cardiovascular Risk Factors and Respiratory Health with Use of Menthol Cigarettes: Informing the Regulation of Tobacco Flavorings to Protect Public Health

There is limited information regarding potential differences in cardiovascular risk factors or respiratory health with menthol cigarette use. The goal of this project is to evaluate differences in systemic inflammation, cardiovascular risk factors, and respiratory health with use of menthol cigarettes among US smokers. Researchers will use interview, physical examination, and biological specimen data from 9,880 adult current smokers who participated in the National Health and Nutrition Examination Survey (NHANES), a series of nationally-representative surveys of the US population, from 1999 through 2016. Study aims are to evaluate the associations between menthol compared to nonmenthol cigarette use by analyzing: (1) markers of systemic inflammation (C-reactive protein, fibrinogen, white blood cell count, and homocysteine); (2) cardiovascular risk factors (hypertension, diabetes, and reduced kidney function); and (3) respiratory health outcomes (fractional exhaled nitric oxide levels, spirometry-defined pulmonary impairment, past year wheeze, and frequent cough and frequent phlegm). Findings may inform regulatory activities related to menthol cigarettes.

Mitochondrial Genetic Alterations: A Clinical Trial of a Standardized Research E-cigarette

E-cigarettes may have the potential to reduce harm for current smokers, but additional research on target organ toxicity (e.g., the respiratory tract) would be useful. This study will focus on the effects of e-cigarette use on mitochondrial DNA (mtDNA) in the lung and nasal tract. Researchers will use bronchoscopy to evaluate the lungs of smokers who are switched to e-cigarettes, namely the National Institute on Drug Abuse (NIDA) Standardized Research E-cigarette (SREC). In this study, 96 smokers aged 21-45, following baseline bronchial and nasal brushings, will be randomized to continue smoking their usual brand (control group), completely switch to the SREC, or receive nicotine replacement therapy (NRT). A follow-up bronchial and nasal brushing will be done after two months of use. Study aims are: (1) to assess changes in mtDNA genetic features (mutations and copy numbers) in the bronchial and nasal epithelium of smokers randomized to continued smoking, exclusive e-cigarette, or NRT use; (2) to investigate whether changes in mtDNA alterations are associated with lung inflammation and gene expression; and (3) to compare mtDNA alterations between bronchial and nasal samples. This study will determine the extent to which mtDNA alterations as a biomarker of harm are reduced following the use of e-cigarettes and provide evidence for the use of nasal epithelium for noninvasive biomarkers of harm.

Electronic Cigarette Cardiotoxicity Varies by Flavorings: What Can We Learn from Mice?

More information about the potential pulmonary toxicity of e-cigarette flavorings would be useful. The goal of this study is to evaluate whether long-term (three-month) inhalation exposure of adolescent mice to flavored e-cigarette aerosols leads to changes in pulmonary blood vessels (vasculature) — such as inflammation, pulmonary remodeling, artery thickening, and increase in right ventricular systolic pressure — that predispose adult male and female mice to pulmonary hypertension. Researchers selected flavors (vanilla, cinnamon, menthol, double apple hookah, and peach schnapps) based on human usage and published diacetyl levels. The study aim (with multiple sub-aims) is: (1A) to determine whether three-month inhalation exposure of adolescent mice to e-cigarette aerosols (with or without flavorings) produces changes in pulmonary vasculature; (1B) to investigate the time course of effects by examining changes associated with the development of pulmonary hypertension and/or emphysema on days 30, 60, and 90; and (1C) to determine persistent effects 90 days after cessation of the three-month exposure. Study findings may inform regulatory activities related to flavored e-cigarettes.

Oxidant Exposure and Related Harm from Tobacco Smoke

Oxidants are a major class of toxicant in tobacco smoke and likely play a critical role in the development of tobacco-related diseases including chronic obstructive pulmonary disease (COPD), cardiovascular disease (CVD), and cancer by causing oxidative stress/damage and inflammation. However, the specific oxidants most responsible remain unclear. The goals of this project are to identify specific oxidants responsible for tobacco-related harm and determine the impact of oxidant reduction on tobacco-related toxicity endpoints. Study aims are: (1): to determine the levels and identity of free radicals and other oxidants delivered by different combustible tobacco products/brands using advanced electron paramagnetic resonance (EPR) spectroscopy and liquid chromatography-tandem mass spectrometry (LC-MS/MS) methodologies; (2) to determine the impact of tobacco smoke oxidants on lung damage and inflammation, comparing effects of high vs. low oxidant brands and tobacco varieties, in mice; and (3) to determine the impact of charcoal filtration of cigarette smoke on oxidant-induced lung damage in mice. Findings will reveal new information on the toxicological importance of oxidant exposure.

Impact of New Standards for Tobacco Products among Dual E-cigarette/Combusted Cigarette Users

Dual users of e-cigarettes and combusted cigarettes comprise 40% of multiple tobacco product users. The goal of this research is to evaluate the potential effects of limiting e-cigarette/e-liquid flavors to tobacco-only on preference for combusted cigarettes. In this study, 280 adult dual users (aged 18 and older) will undergo preference sessions during which they will make choices between an e-cigarette and a combusted cigarette. Study aims are to evaluate users’ self-reported anticipated choices if e-liquid flavors would be limited to tobacco only on: (1) choices for usual brand cigarettes; (2) choices for menthol and non-menthol cigarettes (among menthol-preferring participants); and (3) choices for cigarettes with normal nicotine content versus very low nicotine content. Findings may inform regulatory activities related to product standards.

The Role of E-cigarette Characteristics and Constituents in Cardiac Dysfunction

The acute and chronic health effects of e-cigarettes are mostly unknown. The goal of this project is to identify specific e-cigarette device characteristics and constituents associated with cardiac toxicity. Researchers will conduct electrocardiogram (ECG) and programmed stimulus electrophysiology (EP) studies in mice to test the hypothesis that e-cigarettes induce electrical disturbances in the heart that are related to e-cigarette characteristics and constituents. Study aims are: (1) to determine how device characteristics influence the acute electrophysiologic effects of e-cigarettes in mice, and (2) to assess the impacts of chronic e-cigarette exposure on cardiac electrophysiology and hemodynamics. Real-time cardiac physiology will be monitored during and after acute exposures to aerosols of e-cigarettes with various characteristics (device type, user settings, nicotine levels) to determine how they affect both harmful and potentially harmful constituent (HPHC) production and ECG measures of cardiac dysfunction. The device characteristics with the greatest and smallest acute cardiac effects will be selected for chronic exposure studies that will comprehensively assess cardiac EP and hemodynamics. E-cigarette exposure groups will be simultaneously compared to cigarette smoke and filtered-air exposure groups. This study will present new data regarding the relative cardiac toxicity of different e-cigarette devices, constituents, and settings, particularly with regard to their potential to cause cardiac arrhythmia.

Impact of Novel Heat-not-Burn Cigarettes on Pulmonary Inflammation and Immunity

More information about the impact of heat-not-burn (HnB) aerosols generated from a product called IQOS on pulmonary inflammation and immunity to pathogens that cause respiratory diseases would be useful. The goal of this project is to determine whether HnB aerosol inhalation results in pulmonary damage and suppresses the immune response to respiratory infection and vaccination. Researchers will compare the potential effects of HnB aerosol inhalation exposure to effects caused by cigarette smoke and e-cigarette aerosols in both male and female mice. Study aims are: (1) to evaluate whether chronic inhalation exposure to HnB aerosol has the potential to cause lung inflammation and prompt changes in inflammatory cell numbers and cytokine levels in the lung, thereby altering the innate immune response; (2) to evaluate whether chronic inhalation of HnB aerosol creates an environment in the lungs that has the potential to impair adaptive immune responses to a vaccine and reduce the ability to overcome infection in the lung; and (3) to evaluate whether transition to HnB use following tobacco smoke exposure hinders the reduction in pulmonary inflammation and immune suppression that could be achieved by true cessation. Findings will provide new insights on the health risks of HnB products.

The Impact of E-Cigarette Advertising and Warning Labels on E-Cigarette Use Behavior in Adolescents

Images of sweet/fruit flavors on e-cigarette advertisements may distract youth from health warnings. To better understand how these factors impact youth e-cigarette use, researchers will use functional magnetic resonance imaging (fMRI) and eye tracking to link neural responses to e-cigarette advertising and health warnings to future e-cigarette use in 80 adolescents aged 14-17 years. Participants will view e-cigarette advertisements and health warnings and complete quarterly follow-up surveys for one year. Medial prefrontal cortex (MPFC) and nucleus accumbens (NAc) activity will be measured and tested for relationships with future e-cigarette attitudes, intentions and use. Researchers will also test the specific impact of different categories of health warnings and different flavors and the interactions between these factors, including impact on memory of health warnings. Study aims are: (1) to test the hypothesis that greater MPFC activity as adolescents view e-cigarette health warnings will be related to more negative e-cigarette attitudes and intentions and lower use of e-cigarettes in the next year; (2) to test the hypothesis that greater NAc activity as adolescents view e-cigarette advertisements will be related to more positive e-cigarette attitudes and intentions and greater use of e-cigarettes in the next year; and (3) to compare the relative value of multiple measures –fMRI, eye tracking and surveys — to predict future e-cigarette use in the next year. This project will generate evidence on the impact of e-cigarette advertising and health warnings on youth e-cigarette use and may inform regulatory activities related to flavors, labeling and marketing.

Age of Initiation of Tobacco Products Among USA Youth and Young Adults

Estimating the age of onset of tobacco product initiation, transition or trajectories of patterns of use, and correlates of use among U.S. youth and young adults could be informative. This study involves a prospective secondary analysis of the first three waves of the Population Assessment of Tobacco and Health (PATH) Study among U.S. youth (aged 12-17 years) and young adults (aged 18-24 years) who reported never use at Wave 1. Use of the following tobacco products will be analyzed: cigarettes, e-cigarettes, cigars (traditional cigars, cigarillo, filtered cigars), hookah, and smokeless tobacco. Seven outcomes will be evaluated for each product: age to first report ever or past 30-day use, age to become susceptible to use, age to be an established user (i.e. ever use fairly regularly), age to first report dual/poly use, age to report first use of a flavored product, and age of ever combustible use. Study aims are: (1) among youth who were never users at Wave 1, to estimate their age of initiation of tobacco products and to identify the risk factors associated with age of initiation of each product; (2) among young adults who were never users at Wave 1, to estimate their age of initiation of tobacco products and to identify the risk factors associated with age of initiation of each product; and (3) among all participants, to identify trajectories and transitions in the onset of tobacco product use across time and to identify associated risk factors. Researchers will explore socio-demographic, interpersonal, intrapersonal, social, and environmental factors potentially associated with the age of initiation of the different products. This study will provide new data regarding tobacco product use trajectories among youth and young adults.

Understanding the Real-World Impact of the Use of Three Alternate Nicotine-Delivery Products on Combustible Cigarette Use

In this study, researchers will examine how well e-cigarettes and very low nicotine content cigarettes (VLNCs) substitute for combustible cigarettes in real-world settings and whether this is influenced by nicotine patch use. Study aims are: (1) to examine the ability of VLNCs, e-cigarettes, and no alternative product to substitute for smokers’ usual cigarettes in real-world settings and whether these effects are influenced by nicotine replacement; and (2) to examine the effects of VLNC, e-cigarette, and no alternative product use on the use of study products and the underlying mechanisms that drive such use and whether these effects are influenced by nicotine replacement. Researchers will randomly assign 180 daily smokers aged 18 and older who are not planning to quit smoking to one of three study conditions: VLNCs, Juul e-cigarettes, or no alternative product. Participants will have access to these products for four weeks. During two different weeks, participants will be asked to switch from their usual cigarettes and use only their assigned study product. They will also be asked to use either a nicotine or placebo patch. Participants will record each time they use their own cigarettes or the alternative product in real time via a smartphone, and, for some use events, answer questions about the use context (e.g., affect, smoking permitted) and possible mechanisms driving use behavior (e.g., withdrawal alleviation, taste, satisfaction). Researchers will also examine the impact of factors such as sex, dependence, psychiatric comorbidity, and risk perceptions on use behavior. Findings may inform regulatory activities regarding e-cigarettes and VLNCs.

Investigation into Waterpipe Regimen Effects on HPHC Yields in Smoke and Project Title Charcoal Emissions (Phase l)

The goal of this project is to investigate the relationship between waterpipe smoking regimen parameters and harmful and potentially harmful constituent (HPHC) yields. Researchers will methodically isolate and alter waterpipe smoking regimen parameters (e.g., puff duration, puff volume, interpuff interval) and determine how these parameters affect yields of HPHCs such as quantities of aldehydes, metals, nicotine, tobacco-specific nitrosamines (TSNAs), and volatile organic compound (VOC) levels in waterpipe tobacco smoke. Phase I of this project focuses on the way waterpipes and waterpipe tobaccos are smoked and seeks to determine how these parameters affect waterpipe tobacco smoke chemistry. Findings may provide new information about intense and non-intense smoking regimens for waterpipe tobacco product testing.

Analysis of Tobacco Filler/Matrix-Specific HPHCs

The goal of this study is to identify which of the 93 harmful and potentially harmful constituents (HPHCs) identified by the FDA are present in tobacco products currently marketed in the U.S. Researchers will use validated analytical testing methods to conduct qualitative and quantitative analyses on 27 brands of cigarette tobacco fillers, 24 brands of roll-your-own tobacco fillers, 27 brands of smokeless tobacco fillers, and 21 brands of waterpipe tobacco fillers. Findings may inform regulatory activities regarding HPHCs.

Identification and Validation of a Biomarker of Electronic Cigarette Exposure

The goal of this study is to identify and confirm a biomarker specific to e-cigarette use and secondhand exposure. Study aims are: (1) to confirm that the exact oligomer compounds formed by the thermal degradation of propylene glycol (PG) and vegetable glycerin (VG) are unique to e-cigarettes and not common in other tobacco products; and (2) to determine whether these chemicals or their metabolites are found in urine and/or blood specimens of e-cigarette users and bystanders who experience secondhand exposure. Researchers will confirm the chemical structure of the VG and PG oligomers formed during e