Drink lots of water, like Karen said. It's very good for your system. Stay away from salt because you will retain all that water you've been drinking! If you always kept your cigarettes in the same place in the car, put something else in that spot, like sugar free gum or candy. Or you could carry mouthwash. Go from having terrible ash-tray breath to always having fresh breath.
The last time I tried to quit, I really began to notice how bad other smokers' breath always was, so I always carried a toothbrush & mouthwash everywhere I went.