There are many reasons why we all—advocates and detractors alike—want to prevent underage use of marijuana. One of those reasons was particularly frightening: the idea that teenage use might trigger serious psychological disorders in some people. Previous research has suggested this. But it turns out this may not be true after all.
A 20-year study tracking adolescents into their mid-thirties has concluded that teen marijuana use has no link to later mental health problems. Researchers from University of Pittsburgh Medical Center and Rutgers University expected to see what previous research had hinted at, but were surprised to find no relationship at all.