If you are willing to give up smoking, or you would like someone you love to quit, there is hope. Free Anti-Smoking Screensaver, as the title says, is supposed to help smokers to realise that, while they smoke, they hurt themselves and others.
It's a good screensaver also if you like horror movies!
In this 3D animation the smoker is symbolized with a pretty frightening skeleton who hides himself while smoking and coughing.
The surrounding environment also doesn't look that good - it's a sort of a nightmare fscenario.
Technically speaking the animation is smooth and 'impressive'.
Whether it is also effective, you will have to tell; I can just say it takes a lot of resources to run and when you move the mouse it doesn't respond immediately.
In summary, I would use it just to scare a smoker, but not as an everyday screensaver.
Here's a screensaver you can install or send to your smoker friends as another way to effectively deliver your 'stop-smoking' advice.