Study says that cannabis use among teens increases risk of bipolar, psychotic disorders

NPR | By Rhitu Chatterjee

Published February 21, 2026 at 6:44 AM CST

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Researchers followed more than 400,000 teens until they were adults, and found that those who used cannabis in the past year were more likely to develop psychotic and bipolar disorders, depression and anxiety.

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Rhitu Chatterjee

Rhitu Chatterjee is a health correspondent with NPR, with a focus on mental health. In addition to writing about the latest developments in psychology and psychiatry, she reports on the prevalence of different mental illnesses and new developments in treatments.

See stories by Rhitu Chatterjee