We can, however, look at California, as "medical marijuana" is pretty much legalization in everything except name.
http://www.forbes.com/sites/debrabor.../#76d9731e1355
Quote:
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In California where medical marijuana has been legal for many years in an unregulated environment, marijuana use in teens has remained less prevalent than the years before the marijuana was legal according to results from the 13th Biennial California Student Survey. Stepping back to 2012, a study entitled, “Medical Marijuana Laws and Teen Marijuana Use” by D. Mark Anderson, Ben Hanson and Daniel Rees did not find that legalizing medical marijuana increased pot use in teens. They actually found that during the time period they collected data, pot use increased among teens, but not in the states where medical marijuana was legal.
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