Either way they got the nasty stuff by producing dry hits. dont know about you guys but thats something i tend to avoid...
Apparently this is a big issue with inexperienced vapers, hence the need for temperature control, but I don't see anything about dry hits in the study, either, just that 5v. were used to produce the higher levels. Do 5 volts of power produce dry hits? I don't know; never gone that high...