Cannabis involved in nearly 84% of substance-related ED visits for teenagers aged 16-18, according to a new study from the American Journal of Psychiatrists. A

Cannabis involved in nearly 84% of substance-related ED visits for teenagers aged 16-18, according to a new study from the American Journal of Psychiatrists. ABC News Medical Contributor Dr. Alok Patel has the latest. [▻](https://video.twimg.com/ext_tw_video/2118809491022188545/pu/vid/avc1/720x12…