A trip to the ER for a mini-stroke about 2 1/2 years ago was all the motivation I needed to quit a 40+ year habit.
Physiologically speaking, it only takes 72 hours for your body to overcome the addictive element of tobacco. Psychologically, I don't think you ever really get past it.
For me, there will always be those "associations" that jump up and try to bite me. I no longer have the physical need, but sometimes the time/place/situation serves up a trigger that brings back memories of smoking and I think (almost wistfully) how nice it would be to have just one more. You know... morning coffee and a cigarette... pizza, beer and a cigarette... Jim Beam Black on the rocks and a cigarette...
Ironically, the most frequent time/place/situation is up on the Middle Prong at the end of a long day of fishing. Right before wading back out to head back to the truck, I have this craving to sit back on a boulder, watch the water for a while, and light one up.
That's when I remember, "Oh, yeah... that's right, I quit!"
Best of luck! You've got my prayers and hopes!