The American Academy of Child and Adolescent Psychiatry (AACAP) advocates for careful consideration of potential direct and downstream effects of marijuana policy changes on children and adolescents, and involvement of the medical and research community in policy-related discussions.  Legalization of marijuana for medicinal or recreational purposes, even if restricted to adults, is likely to be associated with (a) decreased adolescent perceptions of marijuana’s harmful effects, (b) increased marijuana use among parents and caretakers, and (c) increased adolescent access to marijuana, all of which reliably predict increased rates of adolescent marijuana use and associated problems.