My wife had a girlfriend, deceased now, that she graduated high school with, that smoked cigs. We didn't see her and her husband much, but we tolerated her smoking when we did see her. One time, she was riding in our vehicle and was going to light up a cigarette and I, very politely, told her "please don't smoke in our vehicle" and she didn't. After she put the cigarette/lighter away, I said "thank you!".
With so many places not allowing smoking anymore, except casinos, we don't have to worry about being around smokers. And, in casinos, the A/C is on so high in the summer, the smell of cigarettes is extremely low.
Years upon years ago, I did smoke, but it was very, very easy for me to quit. I only smoked a pack and a half a week (7 days). IOW, I really wasn't a smoker at all, that is, compared to many people that do smoke. I basically started smoking in the Navy at sea during a middle-of-the-night watch.