Do you have any example of such a campaign? I'm only aware of things like "drugs aren't cool", which isn't going to sway anyone. I wonder what an effective example of a public awareness campaign looks like.
The US undertook a widespread anti-littering campaign in the 1950s. We of course still have rubbish making it's way onto our road and walk ways but it's nothing compared to much of the rest of the world.
And it's nothing compared to what it used to be like in the US. Many people used to think nothing of just tossing food trash out the window.
The whole anti-littering campaign story is interesting. Apparently the original campaign that everyone (at least everyone over a certain age) remembers with the crying "Indian" (who was actually an Italian-American actor) wasn't really all that effective.
One of the later campaigns that were considered more effective included "Don't Mess with Texas" which featured actors like Chuck Norris.