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'''Caffeine''' is the most popular [[drug]]<ref>
'''Caffeine''' is a central nervous system [[stimulant]] found in [[coffee]], [[tea]], [[cocoa]], [[chocolate]], [[soft drink]]s, and some drugs. The source of caffeine is either the coffee bean, the tea leaf, the [[kola]] nut, or the [[cacao]] pod. Pure caffeine is odorless and has a bitter taste.
==Caffeine effects==
==Caffeine effects==
In moderate doses, caffeine may:
* Increase alertness
* Increase alertness
* Reduce fine motor coordination
* Reduce fine motor coordination
* Promotes diuresis
* Promotes diuresis
Like all drugs, it can be over-used. A fatal dose of caffeine has been calculated to be more than 10 grams (about 170 mg/kg body weight) - this would be equivalent to drinking 80 to 100 cups of coffee in rapid succession - a feat only [[Voltaire]] is alleged to have achieved.
Caffeine enters the bloodstream through the [[stomach]] and [[small intestine]] and can have its effects as soon as 15 minutes after it is consumed. Once in the body, caffeine will stay around for hours: it takes about 6 hours for one half of the caffeine to be eliminated.
Caffeine enters the bloodstream through the [[stomach]] and [[small intestine]] and can have its effects as soon as 15 minutes after it is consumed. Once in the body, caffeine will stay around for hours: it takes about 6 hours for one half of the caffeine to be eliminated.