I smoked for roughly 15yrs on again/off again. And quit at least 6 times. The longest was about 4yrs. My neighbor died of complications from COPD and Lung Cancer, that definitely was a bit of a wake up call. But then my husband who also smoked ended up in the hospital with pneumonia. Because of 3 previous hospitalizations for pneumonia when he was a child, asthma, smoking and what they sometimes call "farmers lung" he now has COPD. He is on O2 24/7 and when he was in the hospital, and unconscious he withdrew from the smokes. So he does not smoke anymore, nor do I. It's amazing how many ppl out there on O2 are still smoking. Anyway, After having 4yrs in of nonsmoking I was attacked during a home invasion and started smoking again. Never around my husband and I actually did end up keeping it a secret until I quit again. So I smoked again for about 4-5 months and finally quit again. I didn't use a patch or chantix, although I am not against them at all. Whatever helps.
So I got about 4yrs in now, and have not craved a cigarette in ages. The smell literally makes me ill. Isn't that strange how that works? I LOVED to smoke before. I did chew alot of gum, and bit my tongue so bad I have a hematoma on the side of my tongue that can't be removed! LOL! Anyway, watching loved ones die from smoking helped to open my eyes but basically it was a decision I made that I want to live a full life and don't want to end up sucking O's through a nasal cannula until that's not enough.
If you quit, and end up slipping and smoke a cigarette don't spend all your time kicking yourself over it. Don't quit quitting. It may take a long time but you can do it. Good luck to everyone that is trying to quit. You can succeed.