Medical marijuana laws and adolescent marijuana use in the USA from 1991 to 2014: results from annual, repeated cross-sectional surveys.

The Lancet Psychiatry

“Our findings, consistent with previous evidence, suggest that passage of state medical marijuana laws does not increase adolescent use of marijuana.”

http://www.ncbi.nlm.nih.gov/pubmed/26303557

http://www.thelancet.com/journals/lanpsy/article/PIIS2215-0366(15)00217-5/fulltext

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