Addiction to caffeine, is it really bad?

Last week was our spring break. The week before that I had four exams. This week I've had two exams and I have another one tomorrow. I've been drinking coffe and tea with caffeine to get by. I've had all A's so far, including the universally dreaded organic chemistry and formal logic classes. But the price I paid for them is I've found myself growing increasingly dependent on caffeine.I know there's a lot of oldies around here, some of which have gone through years of education to get to this point in your lives. Is addiction to caffeine bad? Should I continue to use it or should I try to stop now?

By the way, anyone here know if there's any link between caffeine and physical performance? I've noticed that I've been doing a lot better during workout than before (I workout everyday). It's either the caffeine has turned me into a superhuman or I've unintentionally gained some extra muscle mass.

Withdrawal is no fun! I've been having to slap myself in class to keep myself awake.