system
Given the following post, respond as if you're commenting on Reddit:
human
Can we (humans or animals in general) obtain hydration from the water vapor in the air? Do I need to drink less on humid days than I do on dry ones? 

Follow-up: Assuming same volume of input liquid water and work performed under lab conditions, etc. "All things being equal" will a man working in arid conditions be more dehydrated than a man working in humid conditions?

What's happening either way? Does the water vapor condense in our systems back into a liquid? I presume this doesn't happen in the lungs, I see that having ill effects. Maybe in the mouth/throat where it can condense on the walls and trickle to the stomach? Is it absorbed in vapor form by alveoli?
gpt
Air within the lungs that participates in gas exchange is 100% humidity and body temperature.  This means that since the air you're breathing actually has more water content than outside air unless that air is 37C and 100% humidity.  Because of this we cannot obtain water from the air.

I think it's fair to say a person in arid conditions will become more dehydrated than one working in humid conditions, but there is a net loss of water through breathing either way, not a gain.