Many don’t have a full picture of the cannabinoids and their ratios found in traditional hashish. Like me, I long assumed that they were mostly-all THC.
But a 2014 study from Dr Lumir Hanus found that many of the samples from Lebanon, Morocco, and India seized by police were quite high in CBD. The Leb and Moroccan CBD:THC ratios were 3:1, the Indian was 3:4.
Perhaps THC is more labile/less stable than CBD as it is processed and aged? Perhaps THC converts to CBN or CBNa or CBND? How is the terpene Hashishene formed? Or is it a reflection of the naturally high CBD content in older drug Cannabis varieties? Jamaica, too, grows some ganja high in CBD. Greater CBD content moderates the THC high.
CBD is older than THC and Landraces tended to have a 1:1 ratio, so it makes sense that until the CBD was bred-out in the West when selecting for the high 50 years ago, Cannabis naturally had much more CBD than we see today. CBD:THC ratio is considered a scientifically-valid metric for differentiating between drug Cannabis and fibre Cannabis (hemp), as hemp tends to have 20 times or more CBD than THC.
Ironically, using the UN’s definition of hemp (“CBD:THC ratio >1”), even the Leb and Moroccan hash would be considered “hemp.”