Massive study links teen marijuana use to double the risk of serious mental illness

A new study of over four hundred sixty-three thousand adolescents finds that teens who use cannabis face roughly double the risk of developing serious mental health conditions like psychotic and bipolar disorders. Researchers found that cannabis use often preceded these diagnoses by nearly two years, suggesting the drug may have lasting effects on developing brains. The findings add to growing evidence about the long-term neurological impact of teen cannabis use.

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