Effects of cannabis use on human behavior, including cognition, motivation, and psychosis: a review

Volkow et al. summary of evidence on cannabis effects on adolescent brain: persistent IQ decline (Meier 2012 Dunedin), increased risk of psychosis in genetically predisposed adolescents, motivational deficits, and increased risk of cannabis use disorder if onset <16. Cautious about direction of causation but the convergence supports concern about early onset. Foundation for AAP positions discouraging adolescent cannabis use even where legal.