I broke a 10-cup-a-day coffee habit when I was 20... by switching to tea.
After that, I've never been a huge fan of coffee, though strangely, I craved it when I was pregnant -- so I bought a real drip coffeemaker, and perked up some decaf when the cravings struck. Once he was born and I was done nursing, the coffeemaker went back into the cabinet and I went back to tea!
I had a kidney stone ONCE... at first I thought, kidney infection, the pain was so godawful intense... but when I woke the next morning and the pain was just GONE, I knew it had to be a stone. Since then, never again. I suppose that's very fortunate, with my intense love of tea.
Andria