Non-smokers in the 1970s and 1980s, how the hell did you survive the second hand smoke?

Both my parents smoked in the 90's and I never really thought about it until I was like 12, by then it was being banned in many more places. I thought cars smelled weird that didn't reek of smoke. I also sometimes smelled of smoke and probably smelled more to people who were not around smokers. Being around smokers from 0 -18 knock on wood I haven't yet had been diagnosed with anything. Second hand smoke everyday. I never took it up, as we know its not good for you. But I dont mind being around smokers, brings a sort of nostalgia for me the second hand smoke that is.