Over the years, research has overwhelmingly indicated that most young people start using drugs and alcohol in response to peer pressure. The Substance Abuse and Mental Health Administration has a "family" page on their web site that's specifically designed to help parents help their children choose friends.

"Help your child learn what qualities to look for in a friend, and advise him about what to say if offered harmful substances."

The web page list several articles to help parents understand peer pressure, teach children how to say no to drugs, and overall choose their friends and social situations wisely.