The Link Between Marijuana, Psychosis

One mother's mission to unravel the false perceptions of marijuana

Joints in the 1970s had 1–3 mg of THC—the psychoactive component in marijuana—and a near equal amount of CBD—which is touted for its potential in treating seizures. Most joints in Colorado today contain 18–25 mg THC, with much less CBD. David McNew/Getty Images

Lori Robinson remembers patting her 23-year-old son Shane Robinson on the knee, trying to comfort him. He was hallucinating, out of his mind, and had tried to jump out of the moving car; he seemed and sounded completely unlike himself.

She asked, “Did you take any drugs?”