Banned smoking

I think smoking must be banned in expect smoking room, because I hate smell of
tobacco. And, smoking must be bad for body, because smoking cause a cancer. I
asked survey question "Smoking must be banned in all restaurants and bars.
Almost all the people answered "agree". A few people answered "disagree".
Agreed people said I hate smell of tobacco and the room is filled with bad air.
Disagreed people said I felt sorry for the smokers. Almost all of smokers said
disagree, because smokers can't put up without smoking. Smoking give us
nothing. Smoking give us harm, so smokers should nonsmoking gradually.