I think two days is a bit rich. I am sure it was more like four when I stopped.
After that, you are correct, it is merely habit. Triggers wired into your brain telling you 'now just have fag, then do that'.
If you are still craving a fag after a year then you haven't done your job in re-wiring the brain.
It took me two weeks to stop wanting one and a full year to start smoking again
Exactly what I did after a year. I hadn't wanted one in any way whatsoever and was utterly convinced that I had it whipped. I stupidly agreed to have one in the pub. Had another one the following week, a couple the following midweek. Then I had to have one while watching the conclusion of a test series in Sri Lanka...took me a month to accept I was a smoker again. Have been on them ever since.
Giving up was too easy. Next time I will know you can never, ever have another one.
I managed to give up the Colombian, I am sure I can give up the fags.