This just in thanks to John F, from Drug and Alcohol Findings which bills itself as "the only magazine devoted to evidence on the effectiveness of interventions to treat, prevent or reduce drug and alcohol problems."
An excellent free sample article from the magazine, Boomerang ads [pdf] focusing on the failure of the ONDCP's anti-marijuana media campaign. The short version: Not only do the ads have no effect on decreasing the use of marijuana among teenagers, the data suggests that it increased the likelihood of some teens to begin using the herb.
We of course already knew that, but the article lays out the studies that prove it in an easily understandable format and at only two pages of text, easily readable. This one would be hard to find on your own. It's a keeper for the archives.