![]() 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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