Lancet

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Medical marijuana laws and adolescent marijuana use in the USA from 1991 to 2014: results from annual, repeated cross-sectional surveys Lancet, usage, youth, journal, Studies

Our findings, consistent with previous evidence, suggest that passage of state medical marijuana laws does not increase adolescent use of marijuana. However, overall, adolescent use is higher in states that ever passed such a law than in other states. State-level risk factors other than medical marijuana laws could contribute to both marijuana use and the passage of medical marijuana laws, and such factors warrant investigation.

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Lancet Study Lancet, Studies

The study found that 10th and 12thgrade use in Colorado increased significantly after medical marijuana. 
The study did not look at recreational marijuana
The study did not look at marijuana use over an extended period of time....read more on link

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