I've been a 3+ pack a day smoker for 35+ years. Haven't had a smoke for 45 hours.

I feel for you brother! I smoked 25 years and the last few at 3 packs a day. Gum didn’t work, patch didn’t work. Strength of Will alone didn’t work. But I kept trying, just as you will do since you’ve made the decision. My win was due to Wellbutrin. (This May be what Chantrix has in it). It was a depression (?) drug that took away the rush that nicotine gives users, so they just stop getting the rush and then stop feeling the urge to smoke. You can use the drug for as long as you need, reducing the cigarettes you smoke one per day until you feel you can just stop. It took me 30 days and a pep talk from my doctor closed the whole deal and ended my smoking life. You can do this. If not this time, then next time. Talk to your doctor if you want the best way to quit. I never felt anything from the Wellbutrin while I was on it and I used it for 30 days after I quit smoking and never had withdrawal.