If you haven't started it yet, I say don't. I am effectively addicted to caffeine and while it has its purposes it isn't a good think. In the past, every few months I'd stop drinking all caffeine for 1-2 months then I'd slowly wind up starting to drink it again. I haven't done this in the past year, which has sucked.

You can be highly functional and productive without caffeine. Taking a nap and getting better sleep is far better then being addicted to coffee or pop.