two things caused me to quit cold turkey:
1. the banning of smoking in all indoor spaces and within 15 ft of a public doorway (wtf, i live/work in Chicagoland, there's a public doorway every 5 feet, i have to drive out to Indiana to smoke)
2. having a kid. when i had my kid, i didn't want to be a negro who smokes around his kids, so the day my kid was born, i had 3 cigarettes in my pack. i smoked them right in a row and threw out the pack and haven't had one since.
i'm not gonna preach here, smoke yourself to death if you want, but i just didn't want to pay others to poison me. smoker's breath used to be cool 15 years ago, but now you just smell like a doucher.