I was able to quit my 1/2 pack a day addiction four years ago after 15+ years, but it was challenging. Smoking was expensive (four years ago: 4 packs a week = $40), but quitting smoking was even more expensive. In addition to the expense of Chantix, I also started surfing Amazon for things to reward myself instead of going outside for a smoke break. So it was probably $100 - $200 a week. Now nicotine-free for 4+ year…
Quitting isn't that hard. It's just super annoying.
Things like exercising regularly and eating properly take more discipline and willpower, for example.