🏥 Health May 12, 2026 · Danny Bonvissuto

Cannabis and tobacco co-use increases psychosis chances in high-risk cohorts: Study

Vanderbilt Health
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Cannabis and tobacco co-use increases psychosis chances in high-risk cohorts: Study
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Heather Ward, MD



A new multisite study published May 12 in Nature Mental Health found that using cannabis and tobacco together increases the risk of developing psychotic disorders like schizophrenia among those considered high risk.  



Researchers led by Heather Ward, MD, assistant professor of Psychiatry and Behavioral Sciences and director of Neuromodulation Research at Vanderbilt Health, analyzed data from more than 1,000 participants in the North American Prodrome Longitudinal

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