The legalization of medical marijuana did not provoke more teen use of the drug, according to a study published in The Lancet Psychiatry this morning.

The study used data collected from over 1 million eighth, 10th and 12th grade students since 1991. The self-administered test was given most recently in 2014, after 21 states had legalized medical marijuana use.

The study found that 13% of teenagers smoke weed states where medicinal marijuana is illegal, compared to 16% of teenagers in states where medical marijuana was legalized.

However, even before laws were passed, marijuana was more likely to be smoked in states that eventually made medical marijuana legal. The study seems a little flimsy though, since we all know more than 13-16% of high school kids smoke pot.

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