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Tear gas — a class of chemical weapons formally known as lachrymator agents — can cause severe eye damage, blindness, chemical burns, nerve damage, coughing and even respiratory failure for those with preexisting respiratory conditions.

Here the lachrymators and the sternutators, the tear gases and the sneeze gases, came into play.

Large concentrations of lachrymators begin to affect the lungs and cause sickness, coughing and general irritation.

Lachrymators.—There is hardly need to dwell on the next class, the lachrymator.

Mustard gas was the chief example, but some of the lachrymators were just as persistent.