Smoke refers, on the one hand, to conditions that are obscured and confused to the daylight eye of physical perception and, on the other hand, to vaporized or psychized conditions, where the dead soul or image soul leaves the body's matter.
Hillman establishes smoke as the paradigmatic underworld substance — simultaneously an epistemological marker of obscured daylight consciousness and an ontological marker of the psychized, post-mortem soul departing matter.
, The Dream and the Underworld, 1979thesis