The frustration of a parent dealing with a teen and drugs is well known.  Here is a PDF  report that might help :  Adolescent Brain Development and Drug Abuse.   To make matters worse, 5 million adolescents suffer from clinical depression and 70% are undiagnosed.  The numbers for drug & alcohol abuse are worse.; 10% of the  1.4 million American teens with SUD get treatment…” read the article here.   Courtesy of  “The Drug and Alcohol Scene”