HealthDay (4/20, Thompson) reports a study found that teenagers who started using cannabis saw reduced “brain development across a range of skills, including memory, attention, language and processing speed.” The research team “tracked more than 11,000 children from 9 to 10 years of age until they were 16 and 17, following both their brain development and their substance use.” Results indicated that “teens who used weed had restricted development over time. In some cases, weed users performed just as well as – or even better than – others when they were younger, but fell behind as they grew older. Their progress leveled off, while their peers continued to improve. Researchers also found that THC levels in teenagers was related to worse memory over time, but not CBD levels.” The study was published in Neuropsychopharmacology.
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— “Weed Blunts Brain Development In Teens,”Elana Gotkine, HealthDay , April 20, 2026