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caffeine is a GOOD thing for competition. It opens blood vessels stimulating increased blood flow, sharpens reflexes, and cause the eyes to dialate, which helps in target recognition and detection of movement. Athletes use them all the time, and so do competitive shooters.
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Causes the heart to pump harder and faster. When you try to hold steady on a target, you can sometimes feel and see your arms jump or flinch each time the heart pumps blood out. That little jump or flinch can throw your shot off.
It's parrell to having a strong pulse. If you pay careful attention, you can see your cross hairs jump ever so slightly when the heart pumps blood out. Think what running around does to your blood flow when you stop. Sometimes you can feel like your heart wants to pound it's way out of your chest. Stimulants do the same thing only not as severe. If trying to hold a steady sight picture on a target is not critical, then I guess it wouldn't matter. If you want your body to be relaxed and as poised as possible, stay away from stimuilants.