When I was a teenager "good kids" had to sneak around to drink and most of them thought drugs were something that only the bad guys in the movies did.
But the media exposes today's teenagers to substance abuse everywhere they turn. In films drinking and drug abuse are often glamorized by attractive movies stars. When young people see their role models playing addicts but remaining healthy, popular the beautiful, they can lose sight of the dangers of substance abuse.
Many young people have money at their disposal, making it easy to get liquor or drugs. As a result teen addiction and substance abuse has actually become a rite of passage for some wealthy teens.
The media isn't solely responsible, but if parents can help their teens see the real-world consequences of substance abuse, there's a fair chance that the good kids will stay that way.