Why should creating rules to ensure the health and safety of the people be considered oppression?
Because it prevents people from doing what they wish.

You are granted lesser rights if you are in a relationship of the "wrong" kind and you do not have the right to abort a fetus, which will possibly ruin your life, yet you're obsessed with your right to perform idiocy, such as exposing other people to toxic gasses.
What the hell? This makes absolutely no sense. Since when do we not have the rights to abort a fetus? And moreso, how does lack of abortion rights relate to smoking in public?

I just don't understand this "I have the right to stand in the middle of the city shooting in every direction, so I will. If you dislike being shot just go elsewhere." reasoning.
This doesn't deserve a comment. The difference between the two scenarios in question is blaringly obvious.

The bottom line here, is that second hand smoke does not harm you in any way, shape, or form. A smoker must smoke for years in order to do any noticeable amount of damage to his or her body. The amount of second hand smoke one will inahle in thier lifetime is minimal. You don't even get the entire cigarette, you get small portions of it. Do you really think that the small amount of smoke you inhale is really going to hurt you? Simple logic says it won't. The argument about how it "infringes upon my health" is complete bull.