Massive Study Warns Marijuana Use in Teens Is Linked to Serious Mental Illness

Adolescent cannabis use was linked to higher risks of later psychotic, bipolar, depressive, and anxiety disorders. A large new study published in JAMA Health Forum on Feb. 20, 2026, reports that teens who use cannabis may have a substantially greater chance of developing serious psychiatric conditions by young adulthood. The longitudinal study followed 463,396 adolescents [...]