I hear you. I had cancer in my neck and radiation to the throat, not from smoking ( i am a non smoker), but if I even smell smoke or on a heavy smokers clothing I start coughing. Same with smelling vinegar --go figure

My guy they (formerly I) know. After you're hooked it feels out of your control. It becomes a mechanism your brain uses to alleviate stress or to relax. For me, for a long time, it helped me socialize, as I was alone in a new city, working a serving job. After it became a part of who I was, stopping wasn't just ceasing buying and smoking cigarettes, it was now changing my identity and my personality.

I've quit now but I'm here to tell you its big ask of someone, and you shouldn't judge folks who try and fail, but treat it as a vallient effort, and encourage them to try again.

I hear you though, having been a non smoker for a few years now I can smell it and I know what you mean. Just try to remember those are real people behind the addiction, and that for those of us old farts, some of us thought it made us look cool, and were led into it, despite the warnings.