US EditionStudy Finds Any Amount of Regular Weed Use Is Bad for Teens
A national survey of over 160,000 U.S. teens shows even monthly cannabis use doubles risks of poor grades, emotional distress, and risky behaviors, researchers said.
- Reported on Dec. 23, 2025, a Columbia University-led study found that any cannabis use may put teens at risk of academic and emotional problems, with Sultán warning of potential harm.
- Because adolescent brains are still forming, adolescents’ cannabis use disrupts circuits for learning and self-control, and today's products contain two to three times more THC, raising risks.
- Analyzing more than 160,000 responses showed over one-quarter used cannabis, with 18% monthly users twice as likely to skip classes and near-daily users nearly four times likelier to have poor grades.
- Experts urge parents and caregivers to have frank talks, watch for warning signs, and remind teens that `Make sure they understand that 'natural' doesn't mean 'safe,'` Sultán advised with CDC guidance.
- Taken together, the patterns indicate that about 1 in 5 high school students and 6% of 12th graders using cannabis daily signal a public‑health concern, especially with rising THC potency.
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Study claims teens who smoke weed have worse grades
Using cannabis just once or twice a month was associated with worse school performance and emotional distress for teens.
Marijuana use associated with worse school performance and emotional distress for teens
Using marijuana just once or twice a month was associated with worse school performance and emotional distress for teens, according to a large national study of adolescents led by Ryan Sultán, an assistant professor of clinical psychiatry at Columbia University Vagelos College of Physicians and Surgeons.
For teens, any cannabis use may have impact on emotional health, academic performance
Using marijuana just once or twice a month was associated with worse school performance and emotional distress for teens, according to a large national study of adolescents led by Ryan Sultán, an assistant professor of clinical psychiatry at Columbia University Vagelos College of Physicians and Surgeons. The more frequently teens used cannabis, the more likely they were to report emotional distress and other social and academic problems. “While …
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