Yep. "Research has shown" that kids don't trust admonishments of the dangers of drug use when they learn that parents and teachers have lied to them about the basic facts of drug use.
When I was in 6th grade, we did a module in health class about drug addiction. The material described the speed tweak-crash-sleep cycle, no eating, ruin your life. Made no sense to me. I raised my hand and asked, "If it's so awful, why do people do that?" Answer, "They're addicted." Me: "How did they get that way? Why did they start in the first place?" Teacher: "A pusher got them hooked." Me: "How, if it's no fun?" Him: *blank stare*
People in France drink alcohol much more commonly than Americans. It is integrated into their culture in a more healthy way, and as such they have much less a problem with alcoholism than we do. Their kids start drinking wine with dinner as teens, learn how to drink at home so they don't go nuts at school at binge-drink themselves to death.
Of course, we can't even tell teenagers to use condoms, how the hell are we going to tell them they should get high in moderation?