Natural course of co-use of alcohol and cannabis in adolescents and young adults in Montréal, Canada.

We reported proportions of co-use, exclusive drinking (“drinking”), exclusive cannabis use (“cannabis use”), frequent co-use, frequent binge drinking, and frequent cannabis use by age and sex. Results: Co-use rose from 2% at age 12–13 to 23% at age 17, was stable at 44% at age 20 and 24, and then decreased to 37% at age 31. Drinking rose from 20% to 51%, and cannabis use was consistently rare (
Source: Psychology of Addictive Behaviors - Category: Addiction Source Type: research