I've seen guys on cold days do this to warm up their legs and hands. Not right behind the nozzle, but like 15 feet back where the temps are mixed with ambient air and just warm. Not bright! But then again they probably didn't know about oil poisoning - or if its like anything else around here, they were told they probably said, "so what, everything is toxic including age". You can lead a horse to water but, well, yeah...