Key points

Early teen cannabis use correlates with higher use of mental and physical health services in young adulthood.

Teens who use cannabis early have more injuries, poisoning, respiratory, and other problems than abstainers.

Five years of data show that the best advise on teen use of cannabis is: Don't use. Next best: Delay use.

Researchers compared the effects of cannabis on the physical and mental health of teens who started using cannabis before and after age 15. They found that cannabis was neither performance-enhancing nor good for general health and well-being. The data are important because they confirm many other studies warning of the effects of teen cannabis use. But this new study goes further: It examines whether adolescent cannabis use is associated with greater u

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