OK, SD is letting me in now and I found something on treatment (realised halfway through it's about animals but I assume the same holds true for humans):
'Because of the high incidence of sudden deterioration and decompensation in cases of smoke inhalation, it is recommended that exposed animals be observed closely for 6 to 8 hours postexposure before they are released. No smoke inhalation victims should be discharged until they are asymptomatic, are normal on physical examination and ancillary tests, and are otherwise stable. All discharged animals should be seen again within 72 hours to ensure that underlying pulmonary injuries are not progressing.'
I like research.