Twin Study: Marijuana Use Has No Direct Effect on IQ

Researchers reported no dose-response relationship between cannabis use and IQ decline.

The cumulative use of cannabis by adolescents has no direct effect on intelligence decline, according to longitudinal data published today in the Proceedings of the National Academy of Sciences.

Investigators at the University of California, Los Angeles and the University of Minnesota evaluated whether marijuana use was associated with changes in intellectual performance in two...

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