Twenty odd years ago when I stopped smoking it was the routine that I found the hardest to break.
As a 40/60 a day smoker I was lucky I never had any physical dependency to get over but my right hand seemed to have a life of it's own and would reach out to pat desks, sneak into my hand bag when I wasn't looking or even accept a cigarette offered by someone who should have known better but was testing my resolve. I swear my right hand had a mind of it's own and would have carried on smoking on it's own if I hadn't kept an eye on it.
One of the things I did do from day one was to put away the cost of the two packets of cigarettes I would have smoked that day, I never missed doing it as I knew I would always have found the money to buy the things if I was still smoking. Doing it last thing each night gave me a visual reminder of what I was achieving. Even by the end of the first week the money was enough to convince me that I was doing the right thing. I continued to do that for a year and, though I didn't buy a boat like Mr A, I seem to remember that it paid for a lovely holiday.