Thinking about it, I'm probably addicted to tea. I get headaches without a warm cup of tea in the morning… the weird thing is that cold leftovers from the previous day don't cut it. There's some link between warm beverages and some patterns in brain activity, but I'm not sure, if it's related.
I do drink quite a lot of tea, typically green, 5-10 cups/day I think. No coffee for me, because what most people around here serve as "coffee" is gross, smells awful and doesn't have all that much in common with actual coffee; I don't want to go down yet another rabbit hole either.