We are all different, I tackled it fag by fag, by that I mean I stopped the fag in the car in the morning, the post dinner fag, the lunch time fag etc. I then gave up smoking at work and then dropped the evening fag and I was left with smoking in the pub and on holiday and I was like that for years; after whiting out in a pub garden the Christmas before last I dropped the pub ones and on our holiday last year I just didn't want one. So I reckon it took me about six years to go from smoker to non via part time.
After a while you do realise the complete lunacy of smoking.