Its physical yes. But right it feels like a lot more. I am thinking of switching to decaf. (sacrelige I know) I can adjust to not having the buzz. And honestly really, really need to get of the caffeine/no sleep cycle. When you start getting up before 6 something has to give. But I just can't bring myself to give up the warm, tasty goodness of it.
So while spiritual maybe to strong a word, it is definitely more mind thsn body. I have to many good memories of coffee for it not to be.