*Sigh* See. All of us that do smoke, know that it's bad for us. We've been told more times than anyone on earth will care to count.
Also, your comment there about smoking in public? Shove it in the trashbin. UNLESS you see smokers that light one up within inches of you, and puffs the smoke in your face, or anyone elses face, or close to people with kids, etc, don't complain. The wind will wisk the smoke off before it can reach your precious lungs.
I smoke. I also smoke in public. I never, however, go up to a random person and light a cigarette right next to them. It's just courtesy.
Though, if I'm waiting for the bus, sucking happily on my cig, and people walk up and stand next to me? Their own bloody problem. And I dare any of them to complain then.
The air is free. And I will only stop smoking my cigs when/if the day comes that cars running on gasoline are banned, and chucked away. 'till then; *lights a cig* Cheers.