I am very much for it....but since you want a debate I will go against
Well, most adults choose to harm themselves even after the know the ill -effects of smoking. Also, people should just not go to places where smoking is allowed if they do not want to smoke passively.
Also, heavy smokers are not likely to give up since they're addicted to nicotine..Also, smoking tobacco is legal, and cannot be stopped. In fact smokers fund their health care with the heavy taxes they pay on tobacco.
Banning smoking in public places will make smokers want to smoke in enclosed areas which is more harmful for passive smokers.