I made a quick mention about this on Facebook today, but let me give you the rundown.
Sometime this weekend (don't ask what day because they all blurred together) when Emily and I were at lunch, the topic of my shaking came up. She suggested that my shaking may be caused by the amount of caffeine I consume on a regular basis, so I took that as a challenge.
I personally don't think that the caffeine is at fault, but to prove this I suggested that I go without for some time. After I decided that a week should be sufficient, Emily threw down and said that she didn't think I could go a week without caffeine. With that, I called her bluff and raised it to 2 weeks.
My research since then has shown that the symptoms of caffeine withdrawal typically fade after 9 days, so 2 weeks should indeed be a valid goal for this.
However, I am feeling the effects already, even after going just 36 hours without a caffeinated beverage.
The rules to this game are simple: No caffeine shall be consumed at all for 14 days, regardless of the pains associated with the detoxification. If after the 14 days are over the tremors are still present, I will have eliminated that as a suspect and proven my ability to stick to such a decision.
I wish you the best of luck in this with all seriousness. I've tried and failed several times to kick the habit, but it just seems to be the status quo for folks in our field.