Teen Mental Health Risks Rise with Cannabis Use and Heavy Social Media

A large U.S. study tracking 463,396 adolescents from age 13 to 26 found that cannabis use during teenage years doubled the risk of developing psychotic and bipolar disorders, and increased the likelihood of depression and anxiety. Researchers from Kaiser Permanent, UCSF and USC called for urgent public‑health actions to limit youth access and advertising of high‑potency cannabis products.

An Australian ten‑year study of about 1,200 participants aged 9‑19 showed that spending two or more hours per day on social media raised the risk of depression, anxiety and poorer overall mental wellbeing, with the strongest effect observed in girls aged 12‑13. The investigators urged age‑appropriate restrictions, better digital education and clearer guidance for parents.

Both studies highlight the need for preventative strategies to protect teenagers from substance use and excessive digital exposure, warning of potentially significant public‑health consequences if trends continue.