"Very, very, very worrying" — teen cannabis use doubles psychosis risk, study finds

[](https://boingboing.net/2026/02/23/very-very-very-worrying-teen-cannabis-use-doubles-psychosis-risk-study-finds.html ""Very, very, very worrying" — teen cannabis use doubles psychosis risk, study finds")

A study tracking 460,000 teenagers in Kaiser Permanente's Northern California system until age 25 found that cannabis users faced double the odds of being diagnosed with bipolar disorder or a psychotic disorder like schizophrenia. The JAMA Health Forum study was designed to address the chicken-and-egg problem that has dogged earlier research: the team excluded any teen who already had mental health symptoms before using cannabis, NPR reported. — Read the rest

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