my personal experience:
using green tea over time (about 3 servings of 5 grams per time per day) over time I experienced this :
1) weakened bones
2) shrunken veins
3) headaches
4) dry skin and mucous membranes
5) diabetic neuropathic symptoms (peripheral on the right side of the leg)
6) dark circles under the eyes( hypercortisolemia)
7) weird feeling in the head (shrunken ventricles)
8) heart palpitations
9) agitation
10) difficulty breathing deeply 
11) angina pectoris symptoms
12) sleeping difficulties
I should also note that the jews who sold the green tea I bought seemed happy that I was buying it from them as if they knew (which they almost certainly did) that it was a poison and they were 'harming the goyim'. 
Take home message: never use/consume any form of caffeine especially if you are an addictive personality