Part of the problem is that people live in air-sealed rooms now, that was never the case in the past. If you get some sort of air movement going, the problem should be minimised - like in a car. Cars have to have air throughput or the number of collisions would go way up due to people dozing off.
Try this: go through a tunnel with slow-moving traffic in the rush hour, where there is smoke and bad exhaust fumes. Shut off all the fans and vents and try to stop air coming in. You can't, the smoke still comes in. If it's coming in, it's also going out, so there is throughput. This is why vaping in a car is much less likely to offend even though the space is much smaller than a room - new air is always passing through.
We are using the stuff from disco fog machines, and the whole point of those is that the vapor stays around and is visible. There might be ways to minimise that but as long as PG or VG are used, and a room is in effect sealed, the vapor hangs around. It might be best to arrange some ventilation while vaping around others. You can only see the vapor in a beam of sunlight or halogen light (try this: at night, turn off all other lights then turn on a halogen beam light - you'll see what I mean), but that doesn't mean it's not there.
Most vapor is harmless and inoffensive to most people most of the time - but that's not going to be an absolute
I like ventilation but maybe I've spent too much time out on the open ocean. These days people seem to prefer their environment hermetically sealed, they scream in pain if there is even a hint of a draught. Doesn't seem healthy to me
