It can make you jittery, tense, and stressed. And, as you know, stress is a major smoking trigger. So go easy on caffeine or skip it altogether with water or a decaf drink. (If you’re used to a lot of caffeine, ease off slowly so you don’t get bad headaches as you adjust.) If you need something to do with your mouth, chew on sugarless gum, a straw, or even a coffee stirrer.