I remember something like that from college...I wasn't vaping though...
Or you could construct a stealth device.
A cheap one would be the cardboard roll from a roll of toilet paper, filled with cotton balls and one activated carbon bag (used in fishtanks) and a piece of cheesecloth attached to the end to keep everything from coming out of it.
The cotton balls soak up all the moisture in the vapor, and the activated carbon soaks up all the smell.
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