Ever read Isaac Asimov "Robots of the Dawn" where on the planet Solaria, each human is separated by others by acres of land.
At a certain point, his signature detective has to meet a local, and a page-long reflection starts about the person starting to sweat at the thought that the air, having previously been in the lungs of one person, could happen to be in the lungs of the person close to him.
This to say.
vape, before being visible, has been in the lungs of the Vaper, it is right.
But, the
vape is no more than a marker.
The sad truth is, when you are close to another person, you are sharing the same air. Vapor just make it identifiable.
I do understand I am bothered if there is an hi-power cloud chaser in the room, I do understand that the unease is mostly psicologycal, but this is when reciprocal human respect comes into play.
I would allow in my room low-power, pod vapers where their
vape dissolves after one-two feet.
Being considerate is the key.