I think they set up a measuring scale and try to judge the size and distance of the released vapor cloud. They're...large. I couldn't imagine a person actually

I think they set up a measuring scale and try to judge the size and distance of the released vapor cloud. They're...large. I couldn't imagine a person actually making such a cloud in a normal place, but my idea did come from seeing a person use a vape a couple years ago in a bar, nearly across the room, and the scent carried all the way to me. It was cotton candy. Quite interesting sub-culture over that direction hehe.