My parents, my Ex, and my office staff all smoked, so I was used to being around it most of my life, and didn't notice the smell.
Over the years they have all quit. Odie and 4 out of 5 of our kids don't smoke, so I'm pretty much in a smoke free enviroment now. It's amazing much you notice the smoke smell when you are not around it anymore

I can usually tell if someone that comes into my office is a smoker, because they reek of smoke. We avoid bars and restraunts that allow smoking, because we can't stand the smell.
I really apreciate smokers that are curteous to non smokers. I understand that need to smoke, and appreciate when they understand that I can't deal with it in my face.
Although I've never been a smoker (I did try it when I was younger, but it never did anything for me), I agree with Andrew, once in a while, a whiff of a cigarette smells good, it's that stale ashtray smell that I can't stand.
My grandfather used to smoke a pipe, and when I smell a certain type of pipe smoke, it brings back some great emories.