RD42:
(does the "42" have anything to do with the answers to the ultimate questions about life , the universe, and everyhing?")

Caffeine is definitely not the only psychcoactive chemical in coffee. I remember that when I would drink black tea during the weekend and coffee during the week, the tea would do nothing for the headache or depression and fatigue that go along with quitting the coffee habit. The effect was independant of the strength of the tea, or the weakness of the coffee I realized I was going to have to start drinking coffee during the weekend. Switching to decaf during the week also made no difference in the headaches, etc, if I drank only tea during the weekend. Ergo, it is something else besides caffeine that gets us (me, anyway) hooked, and may quite possibly hold off the bad stuff for a while.