I don't consume caffeine anymore, I used to drink an entire pot of coffee every morning though!
You're one of a minority now.  Caffeine is the world's most widely consumed psychoactive drug!  Everyone's doin it man...
I know! It just made me way too shaky.
Being a psychoactive drug, caffeine can definitely have that effect on people.  It is a substance that changes brain function and can alter mood, perception or behavior.
It made me super cranky too all the time, especially if I hadn't had any in a while
Yeah it certainly has it's withdrawels.  Even with all that, it's funny how it's basically one of the only unregulated and legal PA substnaces in nearly all parts of the world.
It should at least have an age requirement I think
Yeah as long as parents agreed, I wouldn't have a problem with kids needing permission to take a substance to relieve or prevent drowsiness and improve performance.