Thanks - not sure if I'll ever quite completely because it's so damn tasty, and relatively harmless.
As to why quit? It's mainly a curiosity thing. I enjoy experimenting with changing different things about my life to see what effect it has on my state of mind/body. Also being dependent on anything even in a small way bugs me.
(I notice than whenever says that they're quitting something, a number of people take it as an inferred suggestion that everyone else should quit it too. You shouldn't. There's nothing wrong with coffee. Or masturbation, or smoking, or drinking, or snorting lines of blow off a shaven patch on the rump of your favourite Labrador, as long as you're not harming anyone, and it's what you choose to do. And you give the dog a steak afterwards.)