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'''Caffeine''' is natural plant [[alkaloid]] found in the coffee bean, the tea leaf, the [[kola]] nut, and the [[cacao]] podin.  [[Coffee]], [[tea]], [[cocoa]], [[chocolate]], [[soft drink]]s, and some drugs all contain caffeine, and when consumed, it behaves as a central nervous system [[stimulant]].  Pure caffeine is odorless and has a bitter taste.

'''Caffeine''' is natural plant [[alkaloid]] found in the coffee bean, the tea leaf, the [[kola]] nut, and the [[cacao]] podin.  [[Coffee]], [[tea]], [[cocoa]], [[chocolate]], [[soft drink]]s, and some drugs all contain caffeine, and when consumed, it behaves as a central nervous system [[stimulant]].  Pure caffeine is odorless and has a bitter taste. Caffeine, in the form of tea or coffee, is the worlds most widely used and popular drug.<ref>https://www.theatlantic.com/science/archive/2016/03/worlds-most-popular-drug/474831/</ref>

==Caffeine effects==

==Caffeine effects==