[astrange]

Why a wisp of smoke? Because they see something grey or are mushrooms out there starting forest fires?

[Alex3917]

If the mushrooms are older you can sometimes see the spores before seeing the actual mushroom. This obviously happens with puffballs, but I've also seen it with Honey Mushrooms and Maitake.

These are really bad for you to breathe in though, so if you see this happening then definitely go in the other direction.

[teddyh]

Maybe he’s thinking of https://en.wikipedia.org/wiki/Puffball

[darpa_escapee]

Visible evaporate == really good mushroom habitat, most of the time.