And there is much fun to be had in the meantime. It can pass while you do something else, because it WILL pass whether you focus on it or not. In fact it will pass whether you give into it or not (it's a fickle addiction), but each time you do NOT give into it, that makes for one less craving before they quit altogether.
Another way to look at it is not that you are quitting The Habit, you're actually letting It Quit You. Biochemically, that is just as true.