imo the duster stuff is getting blown way out of proportion. yes, it's dangerous, if you actually do a deep inhale of a long blast. but cobes is regarded. he's going to do it wrong. no filter, short hits, no real inhalation. yes, someone sent him directions, but giving cobes directions on how to do something properly sounds like a surefire way for him to fuck up doing it properly.
he's doing little baby huffs, spraying a little bitterant on his tongue to freak out the "troles" (conscious reason) and get attention from daddy (subconscious reason).