I totally agree with Kotori.
CB, you should ban alcohol, too, it doesn't hurt people directly as second-hand smoking does, but I think I can easily announce that a huge part of fatal car accidents have something to do with alcohol.
And, speaking of cars, ban them, too. They spread a lot of Carbon Monoxydes, Azote Oxydes, and other cool stuff that will do great things to your lungs, like, cancers, and stuff. And I'm not even going to talk about this nifty thing we call the greenhouse effect.
Ban sugar, it causes vision troubles, diabete....
EDIT : Oh, and i nearly forgot to add : BAN CHOCOLATE ! It is teh EVIL !