Caffeine is the most commonly used mood-altering drug in the world. Caffeine is found in numerous plants, the most widely consumed being coffee, tea, cola nut, cocao pod, guarana, and maté. It is estimated that in North America between 80 and 90 percent of adults and children habitually consume caffeine. About 15% of the general population report having stopped caffeine use completely, citing concern about health and unpleasant side effects.
In the United States the average per capita daily i...
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