I knew several people quite well who had caffeine addictions. It is much more common than reported.
This site has some information on caffeine addictions. I do have some other resources I can pull up for you, but I'll have to dig them up. However
National Geographic believes that it is only a "mental addiction." I tend to believe the chemistry behind it though.
Here are some symptoms:
Quote:
* headache, fatigue or drowsiness
* depressed, irritable mood
* difficulty concentrating
* flu-like symptoms of nausea and/or vomiting
* muscle pain or stiffness
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