Summary: A massive study of over 460,000 adolescents has confirmed that even occasional cannabis use during teenage years is a major risk factor for severe mental illness. The research followed participants from age 13 through 26, revealing that those who used cannabis were twice as likely to develop psychotic or bipolar disorders.<\/p>\n
With modern THC levels reaching record highs, the study found that these psychiatric conditions typically emerged within two years of initial use, regardless of the teen\u2019s prior mental health history or socioeconomic background.<\/p>\n
Key Facts<\/p>\n
Double the Danger: Any self-reported cannabis use between ages 13 and 17 was associated with a 100% increase in the risk of psychotic and bipolar disorders.The 2-Year Clock: Psychiatric diagnoses typically followed the first report of cannabis use by an average of 1.7 to 2.3 years.Potency Warning: Researchers highlighted that today\u2019s cannabis is far more dangerous than in decades past, with flower exceeding 20% THC and concentrates reaching 95%.Scale of Study: The findings are based on a vast dataset of 463,396 individuals followed over a 10-year period.Broad Vulnerability: The risk remained significant even when researchers adjusted for other substance use and pre-existing mental health conditions.<\/p>\n
Source: Public Health Institute<\/p>\n
Adolescents who use cannabis could face a significantly higher risk of developing serious psychiatric disorders by young adulthood, according to a large new study published today in\u00a0JAMA Health Forum.<\/p>\n
The longitudinal study followed 463,396 adolescents ages 13 to 17 through age 26 and found that past-year cannabis use during adolescence was associated with a significantly higher risk of incident psychotic (doubled), bipolar (doubled), depressive and anxiety disorders.<\/p>\n
The study was conducted by researchers from Kaiser Permanente, the Public Health Institute\u2019s Getting it Right from the Start, the University of California, San Francisco and the University of Southern California, and was funded by a grant from NIH\u2019s National Institute on Drug Abuse (R01DA0531920).<\/p>\n
The study analyzed electronic health record data from routine pediatric visits between 2016 and 2023. Cannabis use preceded psychiatric diagnoses by an average of 1.7 to 2.3 years. The study\u2019s longitudinal design strengthens evidence that adolescent cannabis exposure is a potential risk factor for developing mental illness.<\/p>\n
\u201cAs 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, two of the most serious mental health conditions,\u201d said Lynn Silver, M.D., program director of the Getting it Right from the Start, a program of the Public Health Institute, and a study co-author.<\/p>\n
\u201cThe evidence increasingly points to the need for an urgent public health response \u2014 one that reduces product potency, prioritizes prevention, limits youth exposure and marketing and treats adolescent cannabis use as a serious health issue, not a benign behavior.\u201d<\/p>\n
Cannabis is the most used illicit drug among U.S. adolescents. The\u00a0Monitoring the Future\u00a0study shows use rising with grade level \u2014 from about 8% in 8th grade to 26% in 12th grade \u2014 and according to the\u00a02024 National Survey on Drug Use and Health, more than 10% of all U.S. teens aged 12 to 17 report past-year use. At the same time, average THC levels in California cannabis flower now exceed 20%, far higher than in previous decades, and concentrates can exceed 95% THC.<\/p>\n
Unlike many prior studies, the research examined any self-reported past-year cannabis use, with universal screening of teens during standard pediatric care, rather than focusing only on heavy use or cannabis use disorder.<\/p>\n
\u201cEven after accounting for prior mental health conditions and other substance use, adolescents who reported cannabis use had a substantially higher risk of developing psychiatric disorders \u2014 particularly psychotic and bipolar disorders,\u201d said Kelly Young-Wolff, Ph.D., lead author of the study and senior research scientist at the\u00a0Kaiser Permanente Division of Research.<\/p>\n
\u201cThis study adds to the growing body of evidence that cannabis use during adolescence could have potentially detrimental, long-term health effects. It\u2019s imperative that parents and their children have accurate, trusted, and evidence-based information about the risks of adolescent cannabis use.\u201d \u00a0<\/p>\n
\u00a0The study also found that cannabis use was more common among adolescents enrolled in Medicaid and those living in more socioeconomically deprived neighborhoods, raising concerns that expanding cannabis commercialization could exacerbate existing mental health disparities.<\/p>\n
Key Questions Answered:Q: Does \u201cany use\u201d really mean just trying it once?<\/p>\n
A: The study tracked \u201cpast-year use.\u201d This means teens who reported using cannabis even occasionally in the previous 12 months showed the same doubled risk as more frequent users.<\/p>\n
Q: Is the cannabis causing the issue, or are they just self-medicating?<\/p>\n
A: Because the study was longitudinal (tracking the same people over time), researchers confirmed that the cannabis use almost always came first, followed by the diagnosis roughly two years later.<\/p>\n
Q: Why is this happening now?<\/p>\n
A: THC potency has skyrocketed. The \u201cpot\u201d of the 1990s is nothing like the high-concentrate waxes and vapes of today, which can essentially \u201coverload\u201d a brain that is still building its emotional and cognitive foundations.<\/p>\n
Editorial Notes:This article was edited by a Neuroscience News editor.Journal paper reviewed in full.Additional context added by our staff.About this cannabis use and mental health research news<\/p>\n
Author: Renate Myles<\/a>
Source: Public Health Institute<\/a>
Contact: Renate Myles \u2013 Public Health Institute
Image: The image is credited to Neuroscience News<\/p>\n