Nutrition Action Caffeine Corner lists how much caffeine is in various drinks. Starbucks coffee has way more caffeine in than any other drink, and more than caffeine pills. Scary stuff. I grew up in a tea drinking house, two cups with every meal, and another couple mid-afternoon, up to eight cups of black tea a day. I cannot fathom how someone would have time for eight to twenty five cups of coffee a day but I can see how it could be a problem. Black tea is a special treat for me, to be used sparingly and not after midday if possible. Bubble tea is another treat, tea with boiled tapioca balls in. Tastes way better than it sounds!