HIGH CAFFEINE INTAKE LINKED TO Hallucination Proneness
High caffeine consumption could be linked to a greater tendency to hallucinate, a new research study suggests. People with a higher caffeine intake, from sources such as coffee, tea and caffeinated energy drinks, are more likely to report hallucinatory experiences such as hearing voices and seeing things that are not there, according to the Durham University study.

“High caffeine users” - those who consumed more than the equivalent of seven cups of instant coffee a day - were three times more likely to have heard a person's voice when there was no one there compared with “low caffeine users” who consumed less than the equivalent of one cup of instant coffee a day.

http://www.sciencecentric.com/news/article.php?q=09011449-high-caffeine-intake-linked-hallucination-proneness

http://news.nationalgeographic.com/news/2009/01/090114-caffeine-hallucinations.html

ALSO READ

Caffeine or "That Old Black Magic"

http://www.usnews.com/news/national/articles/2009/01/16/health-hot-docs-can-caffeine-cause-hallucinations-a-rise-in-sexually-transmitted-diseases/comments/

One of the problems with caffeine today is that most people have no idea how much caffeine they consume daily. More and more beverage, food and pharmaceutical products have higher and higher amounts of caffeine as an ingredient – even chewing gum! With caffeine everywhere, it's not that hard to become caffeine-intoxicated. Starbucks coffee has 50 percent more caffeine than home brew and just one 16-ounce cup of Starbucks drip coffee has 330 milligrams of caffeine -- the amount that can cause hallucinations according to the Durham University researchers.

Ethic Soup blog has an excellent article on Caffeine Facts at:
http://www.ethicsoup.com/abcs-of-caffeine.html