Disease spirits do inhabit something, for instance a puddle of scummy water, a rock, a plant, a patch of ground, rotting meat, etc. (This explanation is endorsed by Greg.)
Not all "ghosts", which are the incorporeal remnants of living beings, are spirits. Some, such as the ones who were once theists, are daimones. I'm not sure what the spirit ones inhabit. Nor am I clear on what darkness spirits or fear spirits inhabit (though I can live with the "it inhabits a patch of shadow" explanation for darkness spirits). AR, p. 212, offers an explanation that I can live with for fear, darkness, dead person, etc. spirits: They inhabit a place, a physical location. This being the case, these spirits shouldn't have alien world modifiers.
Thanks,
Andy
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