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==Introduction==
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Caffeine is the most widespread psychoactive drug in the world <ref>Burchfield G (1997). Hopes M (ed.). [https://web.archive.org/web/20090726194701/http://www.abc.net.au/quantum/poison/caffeine/caffeine.htm "What's your poison: caffeine".] Australian Broadcasting Corporation. Archived from the [http://www.abc.net.au/quantum/poison/caffeine/caffeine.htm original] on 26 July 2009. Retrieved 15 January 2014.</ref> and is contained in large quantities in coffee and, in lower concentration, in other beverages that are regularly consumed to temporally ward of drowsiness or increase mental performance.
 
Caffeine is the most widespread psychoactive drug in the world <ref>Burchfield G (1997). Hopes M (ed.). [https://web.archive.org/web/20090726194701/http://www.abc.net.au/quantum/poison/caffeine/caffeine.htm "What's your poison: caffeine".] Australian Broadcasting Corporation. Archived from the [http://www.abc.net.au/quantum/poison/caffeine/caffeine.htm original] on 26 July 2009. Retrieved 15 January 2014.</ref> and is contained in large quantities in coffee and, in lower concentration, in other beverages that are regularly consumed to temporally ward of drowsiness or increase mental performance.
  
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