Ammonium nitrate is at least non-toxic. You can sprinkle it on your soup. The exhaust gases are likewise harmless, and even have enough oxygen to keep you alive

Ammonium nitrate is at least non-toxic. You can sprinkle it on your soup. The exhaust gases are likewise harmless, and even have enough oxygen to keep you alive. Sodium azide is deadly both ways. Unreacted azide is nasty stuff. Sodium makes lye when it gets in your eyes or lungs, and is also an extreme fire hazard. There is no oxygen.