If its poppers its butyl nitrate, I dunno if sum countries still allow amyls as legal poppers, but ure mate is prbly huffin butyl nitrate, u can buy em from sex shops and head shops, they dilate all the blood vessels in ure head causing a rush of blood and subsequent mild euphoria for about 10-15 seconds, but when you do em to much they can leave u with a dirty headache, I don't think they're all that unhealthy, I kno amyls weren't, but the government made those illegal, so they replaced them with butyl nitrate, which a lil bit more harmful and gives more side effects.