Okay this might sound crazy, I don't know what kind of party this is, but have you ever thought of a functional costume
, Like come as some kind of oversized vaporizer but inside you actually have a functional portable to vape through..
Does that make any sense? lol
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Or maybe your costume has tubing and a water pouch and you come as some kind of bubbler (that you can also vape through via tubing)
Same logic:
EDIT :
I just found this lol o__o