I don't smoke. Except for a short time in high school when I tried to smoke a pipe (with tobacco in it) I never smoked. I don't like smoke. I try to avoid smokers. If I am sitting at a video poker machine I try to sit in a position so that the smoke doesn't hit me in the face. At craps tables I've asked smokers to hold their smoke in another hand so the smoke doesn't hit me in the face. I prefer non-smoking tables or sections at casinos if they have them with the games I want to play.
With that said, I just checked the research of the Las Vegas Convention and Visitors Authority and their survey of visitors to Vegas in 2014 found that only 3% of visitors said they didn't like Vegas because of the smokers/smoking.
I admit that while I don't like smokers and smoking and smoke in my face, the presence of smokers won't keep me out of a casino. I accept that smoking is part of casino gambling -- except in poker rooms and I hope the no-smoking continues there.
And if smoking is banned in casinos or if more casinos have more non-smoking areas and non-smoking tables that's fine with me.