As a fully remote employee for years who now lives in zoom I have never seen a coworker hit a vape on a call and it would be very off putting if they did, in the same way smoking a cig while on a call would be.
I've seen coworkers do it accidentally, forgetting their cameras are on. It's a super hard habit to quit, too, since it's innocuous (except you can't leave home without your vape!).
Context: work at a big tech co.