I celebrated nineteen years without a cigarette in March of this year. It was perhaps the hardest thing I ever did, but worth it. The keys for me were realizing I couldn't do it alone, finding support, and being willing to work at it using every tool at my disposal.
I found an online support group on USENET and joined that. I practically lived there for quite a while. I ended up using nicotine patches to taper down my dependence on nicotine and, eventually nicotine gum in ever smaller doses to get that last little bit done. It was hard; I discovered I was extremely sensitive to nicotine and for a long time I had to have just the tiniest bits of it in the evening or I couldn't sleep. So it took a long time, but it took what it took and I've been nicotine free for many years.
Along the way I learned a lot of things from watching others struggle. One of the things I learned that was most important was that there is no one way that works for everyone. Some can quit cold turkey, some can't. Some need help. There's nothing to be gained by prideful disdain of any tool that you might have in your toolbox. If you need patches, use them. If you need gum, use that. If you need an inhaler, use that. It's not a contest. It's your life.
Another thing that was probably the most important thing was that many of us had false starts. Some people saw that as failure and are probably still smoking today, if they are still alive. But others realized that they were going through a process and learning what did and didn't work for them. The key for those people was wanting it badly enough to go through what they needed to go through in order to learn how to be a non-smoker. Fall down six times, get up seven times.
There's so much more I could share here. The group I was involved with is still in existence, just moved to Facebook now. PM me if you want and I will gladly share that with you.