Low concentrations of these agents are effective and may not be detectable at the time of exposure. Pathology Vomiting agents produce local inflammation of the upper respiratory tract, the nasal accessory sinuses, and the eyes. Symptoms Vomiting agents produce a feeling of pain and a sense of fullness in the nose and sinuses, accompanied by a severe headache, intense burning in the throat, and tightness and pain in the chest. Irritation of the eyes and lacrimation are produced. Coughing is uncontrollable and sneezing is violent and persistent.
Nasal secretion is greatly increased and quantities of ropy saliva flow from the mouth.
Nausea and vomiting are prominent. Mental depression may occur during the progression of symptoms. Mild symptoms, caused by exposure to very low concentrations, resemble those of a severe cold. Therefore, an exposure may occur that can produce mild symptoms before the presence of the smoke is suspected. If the mask is put on then, symptoms will increase for several minutes despite adequate protection.