Give up water, air, sex, sleeping, and waking up now- You are sober now, and all of those things are also physically addictive...
I will resist the urge to say 'gimme a break' since this is the newcomers section, so I will just say this-
If YOU can't/don't want to drink caffeine, don't.
Folks that say that the day they quit drinking/heroin/whatever, AND quit smoking, coffee, soda and tea the same day don't inspire me- They terrify me, because I think that they are making a ridiculously hard thing infinitely harder on themselves, and setting themselves up to fail.