After failing to quit using "pure willpower", vaping, and even Chantix, I managed to succeed using an audiobook called Alan Carr's Easy Way to Quit Smoking. Worked very well and after a 6 hour listen-through the whole book -- I had been completely turned against the idea of smoking another cigarette.

The ideas in the book stayed with me, and even though I've smoked socially at a bar here and there on occasion, I've never become a "smoker" again, and it's been about 3 years since I was.