Reefer madness debunked as major UK study finds marijuana does not reduce IQ in teens

A large study conducted in the United Kingdom failed to find evidence of a robust link between cannabis use and lowered intelligence among teenagers. The study, published online January 6 in the Journal of Psychopharmacology, found a statistical association between cannabis use and decreased intellectual performance. However, this association vanished when the researchers took other variables into account. “The notion that cannabis use itself is causally related to...

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