Don't know how many people smoke these days, it's not as many as used to. But I have seen a few too many people die way too young because they couldn't leave those things alone. Had an uncle that couldn't. Not a death that was pleasant to watch, wouldn't wish what I saw on an enemy. Some may get away with it. Many do not.
It may be that different people are affected differently by smoke / smoking. I tend to find my voicebox "swelling" and my voice getting deeper when I'm in a smoky room for too long. A similar thing happens when I get a cold and have to cough a lot. I sing a wonderful deep bass at that point but it doesn't last.