Mistral:
I may have to dispute the chocolate. My understanding is that chocolate causes _some_ of the same changes in brain chemistry that substances more generally considered addictive do - elevated endorphins, and serotonin too, IIRC (makes a lovely pain-killer). The brain wants more, so it forces chocolate cravings. I'd call that an addiction, if a very mild one.
My earlier point exactly. Speaking as an ex-chocolate addict, however, I'd query the 'mild'. (I had to give up eating chocolate at all some years ago when my daily chocolate intake threatened to go from two Mars bars to three.)
In so far as any of the B7 material (written or pictorial) can be considered pornographic, it is never *physically* addictive, so comparisons with certain drugs, nicotine or chocolate are unrealistic.
Tavia