I gave up 3 years ago. Before that, I was smoking 40 a day, at least.
Didn't think I could quit, but I started thinking about folk willingly dying of cancer so they could buy some tobacco company rep's son his first sports car, and that helped.
They cost so much, I've saved a fortune. Also - I don't stink anymore (I can smell a smoker now as soon as they walk into a building), have less congestion/sinus problems, get fewer headaches, bounce back from colds/flu quicker, etc.