fuck coffee i'm off the shit and tea too i've abused them for too long. I have a horror story you don't want to hear.

also this:
http://lifehacker.com/5585217/what-caffeine-actually-does-to-your-brain

more or less the article says that caffeine doesn't improve brain activity, only speeds it up. therefore you are less ability in an difficult error prone situation. Unless you are an expert at detecting errors that is.

for example, how hard is it to drive in an unknown city when you are "jumpy"
You make a wrong turn and you are fukt. IMHO this is an excellent example you need to give me credit if you use it. copyright 2010 marinara spaghettificus.

I think I remember reading a paper in science or something that caffeine drinkers have higher bloodflow in their brains then normal. Also, I do not know how I would stay awake right now with out it. There are literally, three huge empty things of coffee on my desk right now.

About half the population are 'slow metabolizers' of caffeine (due to gene variation). Slow metabolizers of caffeine have a significantly increased chance of having a non-fatal myocardial infarction (heart attack) if they drink 2-3 cups or more of coffee a day.

So... there is a lot of information out there saying caffeine is not bad in moderation - I would advise taking this with a grain of salt.

http://www.doctorslounge.com/cardiology/articles/ischemic_heart/coffee_heart_attack/