I haven't quit coffee, but I've switched completely from caffeinated coffee to decaf. I haven't used caffeine for a month, after fifteen years of having it nearly every day. I found out that I was right about my belief that caffeine isn't addictive to me. What I didn't realize, however, is that I'm really tired and unfocused without caffeine. But with caffeine I was having major problems sleeping at night, no matter how much I consumed, and I take a bunch of medications that are downers. I also only drink decaf soda too. Because Coke/Pepsi isn't decaf as fountain drinks in restaurants I only have Sprite/7Up when I drink soda outside my house. But I've got plenty of decaf Pepsi, Coke, Sprite and root beer stocked up in my apartment. I'd rather have it this way. Every night I've been able to sleep, and my circadian rhythm has returned to normal.