Hashish is generally made with high-CBD strains (which is partly why hash tends to mong you out more than weed).
It seems there is evidence that CBD moderates the trippy effects of THC, and reduces the propensity of the product to trigger psychotic states in suceptible individuals.
BTW: in my experience, modern weed strains are beaten in terms of hit-per-gram only by the rarest, highest-grade black hash.