The majority of the damp will blast past the drone in the prop-wash and, in my experience, the internals and motors get warm enough for any damp to soon evaporate quickly - and, as Chis says - no long term issues despite many foggy flights.
The camera is well enough sealed for there to be no issues (since I’ve stripped mine down a couple of times [for other reasons] - I can confirm this).
It’s only the outside of the body casing and motor arms that get damp, and this can be easily wiped off.
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