I am a bit of a coffee snob, and pretty much need my morning two cups. But I couldn't figure out a way to get cream in my coffee reliably (someone suggested Bailey's Irish Cream as an alternative, which is an interesting idea—not sure I would want to start every day with booze though). I went cold turkey on my big tour and didn't have any problems. Less gear to pack, too. I think my body was taken so far out of its routine that the lack of coffee couldn't rise above the din of other unaccustomed inputs.