May I ask what your dosing was? I honestly don't doubt you one bit - but as an ex-25-a-day smoker, a week of endless pacing and sleepless nights and hiding in my cupboard, followed by a week of sleeping and grumbling, and a subsequent year of basically no alcohol (triggering), there's just no comparison to a week of headaches and thirst (caffeine). But, I suppose I do say this as someone with coffee in hand, so maybe staying quit with caffeine has been that much harder...