— As marijuana policy shifts nationwide, researchers are tracking possible link to psychosis
May 21, 2026
• 3 min read
Just what impact nationwide cannabis policy changes might have on psychosis remains unclear, with mixed and emerging data from the studies that have been done, preliminary findings of a systematic review indicated.
Across the 33 studies reviewed, cannabis dose and age at first use appeared to play a role in the risk for psychosis, Jeonghyun Shin, MD, MPH, of Maimonides Medical Center in New York City, said at the American Psychiatric Association annual meeting in San Francisco.
