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A huge study finds a link between cannabis use in teens and psychosis later

NPR | By Rhitu Chatterjee

Published February 23, 2026 at 3:56 PM EST

Researchers followed more than 400,000 teens until they were adults. It found that those who used marijuana were more likely to develop serious mental illness, as well as depression and anxiety.

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