Methemoglobinemia
Altitude related illness
Primary CNS disease
ACS
Carbon monoxide<unk> 
Chemical weapons
Cyanide<unk> 
Hydrocarbon<unk> 
Hydrogen sulfide<unk> 
Inhalant abuse<unk> 
Smoke inhalation injury
Methane toxicity
Methemoglobinemia
Chloroform toxicity
Altitude related illness
Hydrocarbon toxicity
Primary CNS disease
Organophosphate toxicity
ACS