The study authors did claim that the most significant factor in all of the “impairment” data comes from people who consumed “prior to the age of 16”. This allegedly is the major reason why the impairment seemed to be consistent at later stages – however, once again, if we are talking about developmental issues factors like; Did they have a 2-Parent Household? Did they live above or below the poverty line? How many other drugs were abused? Do they smoke tobacco?