![]() ![]() Most studies have compared marijuana users to non-users at a single point in time, and so can’t assess how marijuana changes brain function over the years any observed differences might have always existed, marijuana or not. According to 2015 government data, 15 percent of 10th graders and 21 percent of 12th graders have used marijuana in the past month. ![]() The Backstory: Research on how marijuana affects the developing brain goes back decades, but has heated up as more US states decriminalize or legalize the drug for adults. The Claim: Smoking marijuana does not make teenagers stupid, concludes a study in the current Proceedings of the National Academy of Sciences, contrary to other research that linked getting stoned to impaired cognitive function in adolescents. Gut Check is a periodic look at health claims made by studies, newsmakers, or conventional wisdom. Exclusive analysis of biotech, pharma, and the life sciences Learn More
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