My experience only--smoking is HARD to quit!
When I turned 50 or so, I started trying to stop. Hypnosis, every med advertised and some that weren't, quit coffee (had quit booze and heroin years prior) cold-turkey, tapering, gum, patches, all of it. Nothing worked. BTW, I live in a state that taxes cigarettes so high that a pack of brand-name can cost close to $10.
I don't advise anyone to try this, but it's what worked for me. I got pneumonia, the severe, life-threatening kind. One night I flat couldn't breathe despite having oxygen available (I slept on it only then) and had to call 911. I was semi-conscious at ER intake. They wanted to intubate me but I'm a DNR, so refused. I wound up in the ICU for several days on IV antibiotics, with several kinds of respiratory treatments. (I accepted all treatment except intubation, as my fear of surviving as a veg on a ventilator is way higher than my fear of death.)
The hospital usually offers patches to smokers, but they hadn't thought of that when saving my life, so when they did, after 10 days, I said no. Nicotine isn't all that good for you medically anyway. The physical withdrawals are only about 72 hours, BUT the brain is clever and wants what it wants. So, though I was fine in the hospital, when I got out, surrounded by smoking triggers, it was hard. I was on oxygen 24/7, though (and still am) which kept me from smoking. I started vaping instead but did that about 6 months then realized I wasn't really hooked and gave away all my e-cigs.
This was 5 years ago, and for the most part, I don't think about it. I still have a hard time around people smoking and can't watch old movies where everybody smokes. Since I can't function without the oxygen, taking it off to have a smoke, besides being incredibly stupid, would be unpleasant. I once lit some incense, forgetting about the O2, and lost my eyebrows and about the front 1/2 inch of hair. So there's that! It really is mostly mental, after a couple of days, but believe me, the mind is a powerful thing.