I quit for the second and last time in '82, mainly because I knew full well how bad smoking is for health, over time... and I'd smoked twenty years by then. Especially in the lab, the boss (md, heh) always had one going when he was at his lab desk, and I had one going as a way, I guess, of tolerating periods of doing five or six things at once with timers going for several of them... why not add a seventh?
By the end of it, I often got to opening a third pack a day, though I stubbed some portion of those out. On the other hand, we must have worked in a cloud.
I started taking art classes after work in those years, and yes, I was one of those smokers in painting classes - emoticon time:
A lot of people still smoked so it wasn't as socially icky at the time, though the odd (I thought) person complained from time to time. My brother in law (mr. good), for example.
I quit cold both times I quit - started again after a few years the first time, with my boss smoking my brand next to me at a conference (the quietly expressed "can I have one?" being the start of another 5 yrs. of smoking.)
The next time I quit, it took.
I attribute it working to my attitude of "that is what other people do" when I saw the stacks of cigarettes at the checkout counters in stores - sort of a dissociation thing. I honestly didn't have that many cravings after quitting, at least after a few weeks.
But... I did miss the rigamarole, the good lighter, for example, and had timing issues re things like making an important phone call for the first month or two.
Probably what helped was that I'm an allergic type, and my lungs felt better soon. Not that I didn't still have nasal allergies, but that most of the time I just felt much better. I gained some weight after '82, but eventually got into swimming and jogging and learned to maintain.
The next good news is that I felt calmer. I had always thought that cigs calmed me down, steadied me. Nah, I needed less calming down when I stopped.
Anyway, good luck with it, and have fun with it..