Two recent large studies reflect growing evidence that ADHD increases children’s risk for abusing tobacco, alcohol and other drugs when they are older.
Note: The article mentions a relationship between conduct disorder, in which juveniles show poor impulse control and a disregard for rules, and drug use in general — including alcoholism. A careless reading could give the impression that the author is stating that all alcoholics have conduct disorders. This is emphatically not the case. The remarks refer to a specific subset of young people with ADHD, and not to the population at large.
Read the article at Scientific American