Poppers and Whippets are different. Whippets are small cannisters of nitrous which you use a cracker to open and fill a ballon with and then inhale. Poppers are amyl nitrate. I have only done poppers once and thought they were sweet! I was at a festival really stoned and we had been doing nitrous ballons all afternoon. When we ran out of nitrous my mate had the ingenious idea to get some poppers which they were selling on a stand. We did them watching Dido, Faithless and Muse which was really cool. The headace you get during the come down is shit though.