I've been a 3+ pack a day smoker for 35+ years. Haven't had a smoke for 45 hours.

My dad smoked around me when I was a kid and it never bothered me. But after just under about 2 years after I quit, I can’t stand it at all. When my wife and I go on a cruise, I have to hold my breath to walk through the casino. Then I smell the stink on my cloth for hours after.

I guess some people would never get to that point, but I’ve heard many other quitters say the same thing.
I know a lot of ex-smokers that can't stand the smell as well, and maybe I'll get that way too. I do know my sense of smell has improved a ton.. I can smell the wife having a smoke in the front porch from the garage, lol.