From the ArcaMax Publishing, Trivia Newsletter:
http://www.arcamax.com/news/trivia/s-349235-779153
Caffeine is the world's most widely consumed psychoactive substance, but unlike most other psychoactive substances, it is legal and unregulated in nearly all jurisdictions. In North America, 90% of adults consume caffeine daily. A psychoactive substance is defined as a chemical substance that acts primarily upon the central nervous system where it alters brain function, resulting in temporary changes in perception, mood, consciousness and behaviour.
This news arrived on: 05/17/2008