I was a serious coffee drinker that switched to black tea and finally down to green tea. I've found (and read) that small doses of caffeine are much better for

I was a serious coffee drinker that switched to black tea and finally down to green tea. I've found (and read) that small doses of caffeine are much better for concentration and productivity. I generally have 2-3 cups of green tea a day, get a slight boost in mental alertness, but never get the 'crater' effect of over-consumption. Bonus: I never wake up craving caffeine or needing that first of the morning jolt to become coherent.