agreed nitrous oxide is the propellant in whipped cream canisters look on them...if nitrous wasent a "safe chemical" to be injested it wouldent be used for food products..as with co2 but co2 is more harmfull then nitrous....and the nitrous used in cars HAS A SULPHUR MIX IN IT so yeh thats not smart.....n20=nitrous oxide simple now yall stop bitching