I meant it in the colloquial ‘takes lots of willpower to stop’ sense, not the technical ‘once I stop I get withdrawal symptoms’ sense. (Is there a technical term for the former?)

(OK, it does seem to me that whenever I eat chocolate daily for a few weeks and then stop, I feel much grumpier for a few days, but that's another story, and anyway it's not like I took enough statistics to rule out it being a coincidence,)