I used to smoke for years. I eventually quit but would smoke socially for a while. This past time I got sick I had been going out a lot the month or two leading up to the flare (so drinking more and eating all kinds of crazy things) and also having a few cigarettes - I am convinced now it makes everything so much worse so yes, in my opinion it can precipitate a flare.
If your girlfriend smokes she should smoke outside, that is not too much to ask. Keep in mind this is coming from someone who used to smoke and even then realized that people should not be smoking inside around non-smokers.
Post Edited (wednesday2007) : 12/5/2007 7:40:22 PM (GMT-7)