Maybe shock treatment?

We hear almost every week how 'alcohol is bad for you', 'smoking is bad for you', etc, and I usually ignore them to be honest, but the smoking adverts certainly got me thinking 'Christ, I don't want to end up like that', and encouraged me to give up.
I wouldn't over shock them though if I were you!
Just random shocking facts, pictures of kidneys with alcohol poisoning (if they look any different

), maybe textual testimonies by people who became ill from kidney failure or something.
I remember in one of our Science lessons when we had a long glass tube with a cigarette at one end, cotton wool in the middle and we lowered the pressure in the middle of the tube, and you could see the smoke going through the cotton wool as it was drawn out of the cigarette. The cotton wool went completely black with tar and it demonstrated what it was doing to smoker's lungs. And it really makes you consider it much more than the old 'smoking is bad for you'.
Gone off subject here you were talking about drinking