Initial signs/symptoms - cough, wheezing, dyspnea, irritated mucous members (runny eyes/nose), chest pain, hypoxia
Specific features dependent on type of exposure
Inert gases (carbon dioxide, fuel gases) displace air and oxygen producing asphyxia
Present with severe hypoxia
Irritant gases (ammonia, formaldehyde, chlorine, nitrogen dioxide) when dissolved in water lining respiratory tract produce a chemical burn and inflammatory response
More soluble the gas produces more upper airway burns/irritation symptoms
Less soluble gases produce more pulmonary injury and respiratory distress
Includes carbon monoxide, hydrogen cyanide, hydrogen sulfide
Interfere with delivery of oxygen for use in cellular energy production
Liver, kidney, brain, lung and other organ damage
Inhaled gases, particles, aerosols
Produce bronchospasms and edema similar to asthma
Most fatalities from burn injuries are attributed to smoke<unk> 
Soot in posterior pharynx, singed nasal hair
Hyperacute - severe wheezing, bronchoconstriction, significant hypoxemia
Acute pulmonary edema - onset at 48-72 hours post injury in a previously asymptomatic patient
Bronchopneumonia often at 10 days post-injury
Inhalation injury
Smoke inhalation injury
Cyanide
Thoracic trauma
Carbon monoxide
Trachobronchial injury
Chloramine
Parapharyngeal space infection