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

Science Daily · Jun 28, 2026, 3:54 AM

Why this matters: new research or scientific developments with potential real-world impact.

Teens who use cannabis may face a substantially greater risk of developing serious mental health conditions, including psychotic and bipolar disorders, according to a study of more than 463,000 adolescents. Researchers found cannabis use often preceded these diagnoses by nearly two years, strengthen

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