Psychological studies of coffee

Coffe, probably the most widely used drug, affects the psychological state of those who  consume it. Abuse results in symptoms of caffeinism which include agitation, disorientation  and a syndrome which may be mistaken for

anxiety/neurosis. It is a habit forming drug in which tolerance develops. It affects sleep in a dose related manner which is dependent on the  daily caffeine intake, i.e., high users have less effect. Its central nervous system stimulation can cause pleasant effects with improved attention and concentration at lower doses. At high doses, the reverse may occur. Used judiciously, or as Miss Maggio does, make art with it: http://vimeo.com/71731382