This is a very interesting topic - I was a devout Diet Coke fan and my friend kept telling me how awful it was for me and got me to drink a morning cup of coffee to replace my a.m. Diet Coke.

Well now I'm stuck on the a.m. coffee, still drink up to 3 cans of Diet Coke a day, and find out later that D.C. has 38 mg of caffiene and coffee has 138!! (On average). Never again will I make a switch without researching the facts myself.

Anyway, I also quit caffiene off and on like clockwork, and I never get any desired effects except headache & less alertness. I don't smoke or drink regularly, and caffiene is my only vice. But still, I wonder if I should kick that one last habit...