An Iowa State University study finds two out of five young adults — both attending and not attending college — have at least one substance use disorder. I-S-U psychology Professor Brooke Arterberry says researchers also discovered just one in every 100 college students with the disorder are able to quit, mostly because few young people seek help.

Substances included in the study were alcohol, cannabis, cocaine, hallucinogens, and prescription drugs. More than 3,200 young adults were surveyed.