That's just silly. Vision and smell are totally different senses. You can't not smell something, you can easily not see something. Smell is a more visceral sensation. I could go on, but I hope you won't seriously try to stick with this absurd comparison.

A valid comparison is sound. Do you think that it's perfectly reasonable to have your cell-phone going off in a movie theatre? How about screaming in a library? I'm not saying it should be illegal to smoke in public, just that it's obnoxious. Just as it would be obnoxious to sing (badly) at the top of your lungs on a bus.