I like to breathe too, but I know that second-hand smoke is only life threatening when exposed almost constantly for many years. Again, I don't really think we have the right to deny people the right to smoke, we already deny people so many rights already. I don't really like taking rights away from people unless it is utterly necessary.

So I have the right to assault people in public places? Or maybe to kill people in public places? Because, you know, it's in public so I have the right.
I fail to see how this can relate to smoking, assault is something wholly different. As I said above, it takes years of regular exposure to smoke to cause serious damage.