Did you know some of them have diseases? I could catch pnemonia. Sick people shouldn't be allowed in public. Also, I could have an allergic reaction to someone's perfume/skin lotion/breath mint, so people shouldn't be allowed in public.

I'm guessing your is sarcastic, but if not your cell phone is killing you faster than the absolutely minimal amount of second hand smoke you might get even in a smoke filled bar. Deal with it.