I have slowly weaned myself off caffeine over the last month slowly to avoid the no coffee in the system durring surgery, causing a headache. I was up to 2 cups a day at my hight, and down to one in the morning. That being said, being off it completly now for some time has made NO difference in my pain or muscle tension levels. I would think you would be talking about a pot a day person to make a difference. lol. So I write it off as bunk. Of course we all respond differently to stimuli.
I think a cup a day is great, you have to enjoy something in life.
Cheers,
Jay