Goodbye Coffee

I've given up coffee. 
For a while now, coffee just hasn't agreed with my body. On any given day it could make my stomach upset, give me a headache, or actually make me more tired than before I drank it. 
I'm really surprised at how easy it's been for me to cut coffee out. I quit right before going to Portland, a total coffee town! I quit before going to a conference, which usually takes multiple cups off coffee to get through the hours of sessions. 
I've been drinking teas, and getting chai or decaf lattes to have that "I'm walking around with a warm cup of something in my hand" feeling. 
I've been wondering why it has been so easy to give up coffee, while other things that I know I shouldn't eat (processed things, fast food, french fries, etc.) take so much willpower not to have, and I fail often. I think in the end I could literally feel coffee hurting my body after I drank it, whereas when I eat bad food, it's not as definitive of a physical response. 
Have you given up eating/drinking something you formerly had often?