Is cocaine addictive? How does it effect your immune system? Could it affect you so you need to be in a warm room and normal room temperature make you feel cold?
I believe that It is not physiologically addictive, but is pyschologically addictive.
In practice this definition is of more use to doctors than users, as the craving is as compelling in any case.
"Is Lenin a pickle?" Well, that's opening up a whole new can of worms. If you think the Apollo moon landings were controversial, well, the whole "is it Lenin's body?" thing is not quite as big as that, but quite interesting... and completely off-topic...