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Passage of state medical marijuana laws (MMLs) might decrease adolescents' perceptions of the risk associated with marijuana use as well as make it less expensive and easier to obtain. Investigators studied use rates in four states (Montana, Rhode Island, Delaware, and Michigan) that passed MMLs between 2004 and 2011 and provided data from the Youth Risk Behavior Survey on adolescent marijuana use. Outcomes examined were lifetime and past 30-day use of marijuana, and among users, past week and daily use.
In a series of 40 analyses examining use within states before and after enactment of MMLs and between states based on the year MMLs were passed, only two significant effects were found after controlling for demographic factors: From 2003 to …