Chloracetaphenone, chloro-acetylenone, bro-moacetone, ethyl bromoacetate, bromomethyl- ethylketone chloropicrin and bromobenzyle cyanide cause irritation of the eyes and lacrimation. Inhalation of these gases also cause irritation of the respiratory tract and pulmonary oedema.
Churchil favoured use of poisonous gas, like tear gas (mustard gas or lachrymatory gas) against “uncivilized tribes” to spread a lively terror. Lachrymatory gas and phosgene were used by Germans in world war -1.
Treatment – For irritation of the eye, wash the eyes freely with water. For irritation of respiratory tract, removal of the person to free air, oxygen inhalation and artificial respiration.
Many polycyclic aromatic hydrocarbons e.g. 3-4 benzpyrene are in use in incense smokes. They cause chronic irritation of the respiratory tract and are occasionally carcinogenic..
Acetone, Methyl isobutyl ketone, Ethyl amyl ketone and Methyl n-amyl ketone according to concentration are mild to moderate irritants. Apart from respiratory tract irritation they also cause nausea, headache and dizziness.
Treatment – Symptomatic.