How Scientists Debunked a Study About Medical Marijuana Laws and Underage Use

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It’s one of the main questions voters ask when they consider a cannabis measure: Will legalization — whether medical or adult use — encourage more kids to get high? 

With some form of legalization expected on at least a half-dozen state ballots this November, data showing increased or decreased use by minors will likely be a powerful weapon in the battle for votes.  

That’s why a study published by the International Journal of Drug Policy earlier this week is worth noting. In it, researchers at Columbia University debunked a 2015 report that indicated medical marijuana laws could cause an increase in underage cannabis use. Using the same data analyzed in the earlier report, the Columbia team found “no evidence of a differential increase in past-month marijuana use in youth” that could be attributed to state medical marijuana legalization. 

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