Contrary to popular predictions, legalization of marijuana in Colorado has not increased use among teens; quite the opposite, in fact:
“Cannabis, now that it’s legal, kind of is an old person’s drug,” he said. “It’s something that kids are seeing adults use all over the place. It just doesn’t seem as cool to kids anymore.”
The same phenomenon occurred years ago, when Amsterdam legalized the stuff. It seems that there’s a certain cachet attached to illegal substances, particularly so among the always-rebellious youth crowd; make it legal, and suddenly it’s a whole lot less interesting. LSD use, for example, didn’t really take off until the substance was criminalized in 1967 (1966 in California). Prior to that, though it had been around for years, it wasn’t especially popular. Criminalization established its street cred.
Want teens to use condoms? Make possession illegal.