Prodigy
This stupid looking mask, originally intended for the heavy smoker, can be significantly more effective as an anti-smoking billboard advertisement.

By using the mask pictured here, the user could simultaneously smoke several cigarettes, while creating far too much sidestream smoke for the comfort of anyone sitting around them.

While I found it difficult to believe that anybody would design, build or buy this product, the visual effect is rather memorable.  Perhaps this photo could be used in restaurants as the smoking section sign?