A belated addition to this thread.
My dad was a light smoker. Maybe half a pack a day at his worst. Quit in '79, if I recall correctly.
I've always been sensitive to cigarette smoke - when the smoke first hits me, I actually stop breathing as my throat tries to close off. I've been able to detect cigarette smoke pretty easily.
Ever since my dad quit, he's become very sensitive to it as well. Not in the he misses and craves it kind of way, but that it actually disgusts and nauseates him. He's worse about it than I am.
He'll will be 81 this summer. While longevity seems to run in the men in the family, I'm pretty sure that quitting paid dividends on that.
Story 2: a friend of mine is a smoker. Picked it up in his teens, when all the cool kids were doing it, and into his 30s and 40s has struggled to quit.
Buproprion is an anti-depressant. It is also a smoking cessation med. If they slap on the name Wellbutrin, then it's an antidepressant, but if they slap on the name Zyban, it's a smoking-cessation aid. Both are the exact same drug (hence the mega-warnings about not taking Zyban while on Wellbutrin, and vice versa).
For a while, while depressed, I went through a few antidepressants. Buproprion was the only one that wasn't horrible to me. The only side effect is that I was almost aware of it. While the medication was going, I could tell I was sort of stepping back, and I swear, it was almost like I was narrating to myself - "I am angry/upset about something, but Im able to step back and look at myself and how I feel almost like an outside person."
The only problem with Buproprion is that even the slow release isn't that slow. By the end of the day, I could feel myself getting edgy. Maybe not quite irritable, but definitely something.
Eventually, I tapered off.
My friend has no money, and Medicaid is finicky about covering things sometimes. So, in order to help him, I gave him a full bottle of Buproprion, after looking up dosages, etc., but said I wasn't sure if I could get refills anymore or not. I also warned him of exactly the effects it had on me.
I was a bit concerned, as I thought it would take a while to start working. Interestingly, while my friend's body seems stubbornly resistant to some meds, he told me the Buproprion started working remarkably quickly.
Within the first 3 days, he'd gone from a pack a day, to about 6 or 7 cigarettes a day. He also experienced the emotional and stepping-outside-of-oneself symptoms I'd mentioned. Oddly, he also had a severely reduced desire for the espresso he used to like. He didn't dislike it as a result, but just would have it far less often.
I can't say it'd work like that for everyone. However, if you really want to kick it, ask a doctor about it. Just keep in mind the potential side effects given its alternate use as an anti-depressant. Thankfully, it's not an SSRI/SNRI . . though I may be biased, as the SSRI/SNRI meds really had several downsides, and no upsides, when I took them.