It wasn't until about two years later until I would have several days without cravings.
10 years later, I get cravings maybe once every few months and they are easy to let go of. Two days ago I got into a Lyft and someone dropped a pack of cigarettes in the back seat. The temptation was moderate to take them.
I think in part the brain hardwires to confuse nicotine as a type of food. Do not eat for two days, and that is what a smoker feels like for the first 2 weeks. Do not eat fir a day and that is what the first 3 months felt like (all the time, constantly). Your mind is telling you that you will literally die if you don't resolve the urge.
I think this is why relapse is so high for nicotine. You have to be consistently strong every time for months to almost be hone free. During that 7 years I had relapses usually after days, a few times I made it a week or two, once I went 3 months, and had gone 6 months twice as well before relapse.
FWIW, a person just has to keep trying. I admitted that 1) I deeply loved smoking. It is amazing. 2) there is no such thing as one last cigarette. Relapse would likely occur, and when that happens, my cessation efforts would continue.
As for alcohol, I'll just say that as incompatible as withdrawal is with holding down a job... being drunk is pretty incompatible too. I think if you can finesse one, you can probable finesse the other.
In general, my observation has been that as horrible as withdrawal is, that's the easiest part of kicking a habit.