An interesting point to view at any drug (including alcohol and even coffee) is presence of social stigmas. Coffee has very mild (almost none) social stigma associated with its consumption: ppl would recommend to drink less if you are obviously overconsume it. Alcohol has somewhat harsh social stigma starting from certain point and actually some encouragement in small doses. Cannabis seems like has no stigma (outside of some circles) in small doses and somewhat mild for overconsumption. No research, just my observation, but i would like to see one.