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
Caffeine
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is the world's most widely consumed psychoactive drug. Unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world. There are several known mechanisms of action to explain the effects of caffeine. The most prominent is that it reversibly blocks the action of adenosine on its receptor and consequently prevents the onset of drowsiness induced by adenosine. Caffeine also stimulates certain portions of the autonomic nervous system.
Caffeine
far greater risk of serious side effects.
Notable stimulants Caffeine.
Caffeine is a stimulant compound belonging to the xanthine class of chemicals naturally found in coffee, tea, and (to a lesser degree) cocoa or chocolate. It is included in many soft drinks, as well as a larger amount in energy drinks. Caffeine is the world's most widely used psychoactive drug and by far the most common stimulant. In North America, 90% of adults consume caffeine daily. A few jurisdictions restrict its sale and use.