National Institute on Drug Abuse (NIDA) for Teens
Here is a website that is very good on factual information on substance use:
The National Institute on Drug Abuse (NIDA), a component of the National Institutes of Heath (NIH), created this Web site to educate adolescents ages 11 through 15 (as well as their parents and teachers) on the science behind drug abuse. NIDA enlisted the help of teens in developing the site to ensure that the content addresses appropriate questions and timely concerns.
Recognizing that teens want to be treated as equals, NIDA scientists were careful not to preach about the dangers of drug use. Rather, the site delivers science-based facts about how drugs affect the brain and body so that kids will be armed with better information to make healthy decisions.