Everybody's different. What works for one person won't necessarily work for another and what triggers one person won't necessarily trigger another. It's one of the reasons my attitude this go-round (as this is not my first time on the Quittin' Train) is to just take it one day at a time. Looking ahead and worrying about what will trigger me in the days ahead seems like a losing strategy to me, so in that sense I agree with Roy. That said, one of the things that motivated me to quit last week (I'd been thinking about it seriously for a couple months already) was I had a cold and figured it was a good time to hole myself up at home for the physical withdrawal portion. I'm certainly past that now, though. Can't keep avoiding the world indefinitely. Probably good that my first alcohol encounter will be in a cigarette-free environment though. That way, when I drink somewhere where there are cigarettes, I can hopefully remind myself that I drank without'em and nothing bad happened.
Something else I'm doing that has been at least a little helpful: I'm keeping a list of reasons why quitting smoking is a good thing and then read through it when having a particularly bad craving. The obvious stuff is on there (health, save money, etc.) but if anyone wants to suggest things to add I may not have yet considered, I figure the longer the list the better. (My favorite entry so far: "Tell the doctor to shut up.")