I believe the intensity on the pharmecutical grade Nitrous doesn't have the same principle for letting fuel burn at a faster rate either. I believe it was all a difference in the chemical agent intensity of sulfer and nitrogen....I believe.
I found this out from a local Nitrous/Co2 distributor that told me the story of how one of his employees was screwing around with the No2 bottles and joked about getting high. He somehow purged the bottle and inhaled a cluster of the chemical causing him to fall over and pass out. He was rushed to the ER and was treated for chemical inhilation. He lived from what I hear, but was then unemployed to say the least.