My story, and my motives, will probably be different from a lot of accounts posted here.
I started smoking in 1988 and ultimately quit in 2009...so a run of about 21 years, which means I've been free from it for 14 years.
My Story: My tobacco of choice was 'Drum' and I hand-rolled and smoked without filters. I liked Drum because it tasted great to me, I liked the idea of hand-crafting each and every cigarette I smoked, and it was a pretty cool party-trick to be able to produce perfect hand-rolls out of tobacco or whatever - where ever I was, I was always the designated roller. It was also WAY cheaper than traditional cigarettes - I could buy a can of Drum that would produce 250 cigarettes for $12 - and that was due to a loophole in the state's cigarette tax. Prior to 2009, the state only heavily taxed cigarettes, but not the individual supplies to make cigarettes (like loose tobacco). That loophole got closed in 2009 and the cost of a can of loose tobacco went up from $12 to $49 over night. I'd known for a while that I should probably quit, but I just never got to that mental acceptance of doing it, until this new tax came along. Ultimately, I decided I just wasn't going to pay that new tax and so I didn't really decide to quit smoking, I decided I was going to quit buying tobacco (which has the same end result). At first, I started cutting back, to make my remaining supply of tobacco last as long as possible. The lower my stock got, the farther back I cut down. At first it was limiting myself to 4 a day... then 2 a day (that I would smoke over 4 sessions), then 1 a day that I'd light and inhale a few times and put out and save for later. I stretched this out for months....and then one day it was gone. I didn't use any medical aids, I didn't use any substitution with something else. I just quit. I should also mention that I'd also always enjoyed cigars...and typically enjoyed about 6 cigars a year, but I'd decided to cut that out also. Shortly after quitting, I told myself that I'd treat myself to a cigar only after I could go 1-full-month without thinking about smoking. This went on for months, and I actually thought about smoking all the time. At first, several times a day...and then several times a week, and then eventually just once in a while. It actually took about a year after quitting that a friend and I were talking about it (he was quitting also) and I realized I hadn't thought about smoking for several months. Finally, I seemed to have fully broken both the physical and mental addiction. It was about six months after that that I decided to treat myself to a cigar. These days, I have about 3 cigars a year (all on special occasions) - which is a small enough number not to re-kindle my desire to smoke more.
It's nice to be escaped from the habit, the financial burden of it, and the negative health aspects. The other great side effects: lower life insurance premiums, whiter teeth (and easier/quicker dental cleanings), clothes that don't smell like smoke.