Inhaled toxins include gases, dusts, fumes, and aerosols and generally cause acute dyspnea, burning of the mucous membranes, cough, and bronchospasm. Common irritating gases include chorine, ammonia, hydrogen sulfide, and nitrogen dioxide. Some gases, particularly nitrogen dioxide, chlorine, and phosgene, can cause delayed pulmonary edema. Consider systemic toxicity from carbon monoxide and cyanide whenever there is a history of combustion. Some of the more common dangerous inhalations are described in Table 115-2.