I hate cigarette smoke. I can understand why someone would use them and I have no problem with them at all as long as they don't come up to me and blow smoke in my face. I'd punch them in the gut and throw their coughed out cigarette in the bin if they did that.
Edit: When you think about it, wouldn't exposing someone else to poisonous fumes your producing constitute as bodily harm? Lung cancer seems pretty harmful to me. Makes me wonder why it isn't illegal to smoke in crowded places.