I tried several times over the years and never really did it because I didn't want to. I did quit once with the gum, but circumstances had me back in a month. When I didn't have much choice for a few days, I stayed with it. When shit got difficult, I dealt with it.
Don't romanticize the last one, don't switch to lights. Just say you're going to quit come Monday and do it. Maybe cut down drastically and over the course of a few days first, that's pretty much how it went.
I could never go back. I can outrun all of my friends now, pedal a bicycle forty miles at a time, paddle a canoe across the reservoir, and enjoy a quality of life better in more details than I could ever express here.
I can ride a bicycle twenty miles a day, every day, with no soreness. Longest ride this summer was fifty five miles in one day. I never would have imagined I could do such a thing. I'm stronger than I've ever been in my life. I still look down at my legs sometimes in surprise that they're mine. The desire to smoke has been gone a long time, and I feel nothing could possibly drive me back to it. It lost every bit of its appeal.
If you're considering giving up the habit, do it. You have nothing to lose, and everything to gain.