Yes but a humectant is a moistening agent.
hu⋅mec⋅tant

/hyuˈmɛk
tənt or, often, yu-/

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nt or, often, yoo-]

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noun 1. a substance that absorbs or helps another substance retain moisture, as glycerol.
adjective 2. moistening; diluting. 3. of or pertaining to a humectant or humectants.
Humectant - A substance that attracts and holds moisture unto itself, such as
glycerin.
So I don't get it why would PG or VG dry your throat out?

Maybe it's the nicotine in the liquid that dries your throat out.
That's probably it.
~Paula