Also I never made any claim that the "average" drug user was a child, just that it is a huge problem. The drug addicts that you know might have been adults when they first started using, but without exception, every one of the dozens of drug addicts I know started as a teenager. I can only speak from personal experience.
Feigning ignorance to the fact that there is an epidemic of children in our country becoming addicted to drugs is the most "woefully misinformed" thing I've ever heard. Just because someone wants to be pro-legalization, doesn't mean they have to ignore reality.
Edit: Apparently I have a habit of using the terms drug addict and drug user interchangeably. No offense was intended by this and I'll try to be more specific in the future. I understand that there is a distinct difference.