Lewisite is irritating to the respiratory tract, producing burning. Profuse nasal dis-charge, and violent sneezing. Prolonged exposure results in coughing and large amounts of froth mucus. Vapor exposure to the respiratory tract produces much the same symptoms as mustartd. The main difference is that edema of the lung is more exceptional and may be accompanied by pleural fluid. Lewisite does not affect the bone marrow, but does cause an increase in capillary permeability, with ensuing plasma leakage into tissue. This results in sufficient fluid loss to cause hemoconcentration, shock, and death. Exposures that do not result in death can cause chronic conditions, such as sensitization and lung impairment. Lewisite is a suspected carcinogen