Teen Cannabis Use Linked to Doubled Risk of Psychosis and Bipolar Disorders: A Growing Concern
A new study published February 20, 2026, in JAMA Health Forum reveals a concerning link between adolescent cannabis use and a significantly increased risk of serious mental health conditions. Researchers followed over 463,000 teenagers from ages 13 to 26 and found that past-year cannabis use during adolescence doubled the risk of developing psychotic and bipolar disorders.
The Rising Potency Problem
Today’s cannabis is not the same as that of previous generations. THC levels have dramatically increased, often exceeding 20%. This heightened potency, coupled with aggressive marketing tactics, is raising alarms among public health experts. Dr. Lynn Silver, program director at the Public Health Institute, emphasizes that “as cannabis becomes more potent and aggressively marketed, this study indicates that adolescent cannabis use is associated with double the risk of incident psychotic and bipolar disorders.”
Beyond Psychosis and Bipolar Disorder: Other Mental Health Impacts
The study’s findings extend beyond psychotic and bipolar disorders. Researchers also observed a 34% increased risk of depression and a 24% increased risk of anxiety among adolescent cannabis users. Importantly, these risks remained elevated even after accounting for pre-existing mental health conditions and other substance use.
Timing is Key: Cannabis Use Precedes Mental Health Diagnoses
The longitudinal nature of the study provides strong evidence of a potential causal link. Cannabis use typically preceded mental health diagnoses by an average of 1.7 to 2.3 years. This suggests that cannabis exposure may be a contributing factor in the development of these disorders, rather than simply co-occurring with them.
Prevalence of Teen Cannabis Use in the U.S.
According to background information included in the study, over 10% of U.S. Teens aged 12-17 have used cannabis within the past year. By the time they reach their senior year of high school, approximately 26% have experimented with the drug. These statistics highlight the widespread nature of adolescent cannabis use and the potential public health implications.
The Need for a Public Health Response
Dr. Silver advocates for an urgent public health response, focusing on reducing product potency, prioritizing prevention efforts, limiting youth exposure to cannabis marketing, and treating adolescent cannabis use as a serious health issue. This includes providing parents and children with accurate, evidence-based information about the risks.
Did you understand? The study analyzed electronic health record data from routine pediatric visits between 2016 and 2023, providing a large and representative sample.
Expert Insights from the Public Health Institute
The Public Health Institute (PHI) has been at the forefront of research and advocacy related to cannabis regulation and public health. Dr. Lynn Silver, a senior advisor at PHI, has also discussed the threats posed by high-potency cannabis in a New York Times article and on KALW’s State of the Bay program. PHI’s “Getting it Right from the Start” program focuses on advancing public health and equity in cannabis regulation.
Frequently Asked Questions
Q: What is THC?
A: THC is the primary psychoactive component of cannabis, responsible for its intoxicating effects.
Q: Is all cannabis equally risky?
A: No. The study highlights the increased risk associated with the higher potency of cannabis available today.
Q: What can parents do to protect their children?
A: Parents should educate themselves and their children about the risks of cannabis use and have open conversations about substance use.
Q: Where can I find more information about this study?
A: The study was published in JAMA Health Forum on February 20, 2026, and information is available on the Public Health Institute website: https://www.phi.org/
Pro Tip: Early intervention and access to mental health services are crucial for adolescents struggling with substance use or mental health challenges.
Have thoughts on this important issue? Share your comments below and let’s continue the conversation. Explore other articles on our site for more insights into public health and wellness. Learn more about Dr. Lynn Silver’s work at PHI.
