[Editor's note: This post is excerpted from this week's forthcoming NORML weekly media advisory. To have NORML's news alerts and legislative advisories delivered straight to your in-box, sign up here.] The enactment of state laws allowing for the limited legal use of cannabis by qualified patients has little to no causal effect on broader marijuana use, according to data published online in the journal Annals of Epidemiology. Investigators at McGill University in Montreal obtained state-level estimates of marijuana use from the 2002 through 2009 US National Survey on Drug Use [...]

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