[xekc]

So, generally speaking, anything a large enough group of people would find themselves too passionately engaged in - can be considered at it's extremes as a disorder - from utilitarian, dominating "usefulness of the body" perspective? Ant world!

Then extreme sports go next? "Base jumping addiction" (deadly!) or let's just go big and make "adrenaline junkie" a serious medical condition? Who in Sci-Fi got this right?