Impact of Medical Marijuana Laws (MMLs) on Cannabis Use by Youth
(Impact of Medical Marijuana Laws (MMLs) on Cannabis Use by Youth) "We replicated the findings of Wall et al. (2) that marijuana use was higher in states that have passed MMLs, and our analysis suggests this is unlikely to be a causal association. Our difference-in-differences estimates suggest little detectable effects of passing MMLs on marijuana use or perceived riskiness of use among adolescents or adults, which is consistent with some limited prior evidence on arrestees and emergency department patients (17).