It is generally bouncer/venue discretion if u can bring a popper in. I found that a lot of clubs don't mind but have had managers come up to me and tell me to keep it low profile as I was shamelessly just walkin up to all the drunk annoying ppl and making them take a big whiff. Btw, I aint big on poppers but they are a novelty in this regard. E.g, At Club Evil (Club 77 or whatever the fuck) there was this really annoying drunk bogan around who wouldn't leave anyone alone, so I just made some chit chat, told him to take a HUGE whiff of some Xtra Strong shit. It was funny as fuck, he first went "this shit is like liquid X" then he started to stumble while dancing, then he finally fell on a goth chick and passed out sorta (his arms were flailing about, quite comedic). So yes remember kids; REALLY drunk ppl + offer of amyl = instant hillarity :D
Peace Out