I've been getting more into caffeine ever since I quit pot about a year ago. It's like brewing tea became a ritual that filled the void of quitting smoking pot. I think it's good to remember the limit to moderate caffeine consumption, which is around 300mgs a day, so 3 cups of coffee, around 6 cups of black tea, or 12 cups of green tea. The best thing you can do when tackling caffeine use is keep a tally of of how many mgs you take, in what form, and when. Usually adverse effects like headaches and crashes come when you exceed this limit.
There's also caffeine free teas, I find Tetley's decaffeinated Orange Pekoe to be decent with honey and milk. Rooibois and chamomile are also delicious and very good for your health, of course that doesn't help you coffee drinkers. Try to eat lots of bananas and take B vitamins if you feel yourself drained from too much caffeine.
Anyone here have a problem with caffeine pills?