findings from only 5 of the 16 states with existing medical marijuana laws which reduced its generalizability (Wall et al., 2012). Most recently, using the Youth Risk Behavior Survey for Montana, Rhode Island, Michigan and Delaware, Lynne-Landsman and colleagues examined whether medical marijuana laws were associated with changes in adolescent marijuana use; they concluded that such laws had not had a measurable impact on use patterns, at least in the first few years after enactment (i.e., 1-5 years; Lynne-Landsman et al., 2013).
