Abstract: The present invention provides a method of using agents which can modulate TRPA1 function as counteragents to inhibit the physical effects of chemical irritants/toxicants when given prior to exposure or to lessen the physical effects when administered post exposure, and more specifically, to a method for counteracting the acute physical noxious effects of toxicants, including but not limited to, tear gases, chlorine, hydrogen peroxide, ammonia, phosgene, chloropicrin, isocyanates and mustard gas. Administering the counteragents counteracts pain, inflammation, lachrymation, blepharospasm, respiratory irritation and depression, airway mucus secretion, airway obstruction and injury, cough and incapacitation and cutaneous chemical injuries. Another embodiment provides a method of preventing or treating a disease or condition in a mammal, which disease or condition includes hypersensitivity to chemical stimuli, particularly in regards to inflammatory airway conditions, such as asthma, rhinitis, etc.