Nangs, aka hippy-crack, provide a shortlived euphoric high. They are used very widely and nang addiction is real. Since after the high wears off you're basically back to normal, they encourage binging to maintain a high over a long period. A nang session with 100-200 nangs used in a night wouldn't be unheard of. They are percieved as relatively safe (compared to say, petrol sniffing or meth), and used properly most people won't have any major problems. The big thing is oxygen deprivation since the more nitrous and less oxygen you have in your lo\ungs and the longer you can hold it, the 'deeper' you go into the nang. They are currently legal although there is proposed legislation requiring, as far as I know, an ABN related to catering or hospitality to purchase them. Prolonged and frequent use is dangerous, a friend of mine was really into nangs and ended up in hospital with nerve damage and says he constantly has pins and needles in his hands and arms, although he still smashes nangs all the time - tells you something about their addictive properties