Exposure to HF may result in rapidly progressive or fatal respiratory failure despite minimal external evidence of injury. 
Symptoms include shortness of breath, cough, or hypoxia; there must be a high level of suspicion for HF inhalation.
Hydrogen fluoride toxicity
Smoke inhalation injury 
Bath salts toxicity
Chemical injury
Jet Propulsion Fuel 8 toxicity
Acrolein
Lewisite toxicity
Hydrochloric acid