I'll be the devil's advocate, since I am in a country in which smoking is still extremely prevalent
Why don't you go with your impulse and see what she's like? Maybe she is not a chain smoker. These days in the US people are very sensitive about smokers' odor and hygiene. She may be concious of this sensitivity and brush her teeth in anticipation of being intimate. If she doesn't give you that courtesy then you will at least know firsthand.
If she puts her cigarette out on your head, I think that's a sign too