I really like this poster. The shadow of the hand and cigarette appears to be a hand holding a gun. It would look even better with smoke coming out of the cigarette, making it look like the gun was just fired.
Nice advert by the Vermont Department of Health, warning pregnant women about the effects that smoking can have on their babies and encouraging them to quit. Really hate selfish women who continue to smoke and drink, or worse, during pregnancy.
Another smoking poster, this one highlights the potential effects of smoking: You get lung cancer. Though simplistic, this poster really paints a clear picture of what really happens as a result of smoking.