JAMA Study: Teen Marijuana Use Doubles Risk of Psychosis and Bipolar Disorder
A landmark JAMA Health Forum study of 463,396 adolescents aged 13-17 found that teen marijuana use more than doubles the risk of developing psychotic disorders and bipolar disorder by young adulthood (age 26). Using electronic health records from Kaiser Permanente Northern California, researchers found that cannabis use typically preceded psychiatric diagnosis by 1.7-2.3 years. This is one of the largest longitudinal studies ever conducted on adolescent cannabis use and mental health outcomes.
Key quotes
A landmark population study involving nearly half a million teenagers has found that adolescent marijuana use is associated with more than double the risk of developing two of the most serious mental illnesses known — psychotic disorders and bipolar disorder — by young adulthood.
The research, published in JAMA Health Forum on February 20, 2026, tracked 463,396 adolescents aged 13 to 17 through age 26 using electronic health record data from Kaiser Permanente Northern California.
It represents one of the largest longitudinal studies of its kind ever conducted on adolescent cannabis
You might also wanna read
Massive study links teen marijuana use to double the risk of serious mental illness
Longitudinal Study Links Adolescent Cannabis Use to Increased Risk of Psychosis and Mental Health Disorders
A new longitudinal study published in JAMA Health Forum finds that cannabis use among adolescents increases the risk of being diagnosed with
text.npr.org·4mo ago
Major Lancet Review Finds Medicinal Cannabis Ineffective for Anxiety, Depression, and PTSD
A major systematic review published in The Lancet finds that medicinal cannabis does not effectively treat anxiety, depression, or PTSD, des
Study Links Early Smartphone Ownership Before Age 13 to Worse Mental Health Outcomes
A study published in the Journal of Human Development and Capabilities found that children who own smartphones before age 13, particularly g
abcnews.go.com·7mo ago
Cannabis use linked to higher heart attack risk, two new studies confirm
Two new studies presented at the American College of Cardiology's Annual Scientific Session reveal that cannabis users face a substantially
acc.org·3d ago
Study of 4 Million Adults Links Cannabis Use to Quadrupled Type 2 Diabetes Risk
A large-scale study analyzing data from over 4 million adults found that cannabis use is associated with an almost quadrupled risk of develo
medicalxpress.com·9mo ago
Comments
Sign in to join the conversation.
No comments yet. Be the first.