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  • Tear gas, formally known as a lachrymatory agent or lachrymator, is a chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, vomiting, and even blindness. Common lachrymators include pepper spray, CS gas, CR gas, CN gas, nonivamide, bromoacetone, xylyl bromide, syn-propanethial-S-oxide, and Mace. Lachrymatory agents are commonly used for riot control. Their use as chemical warfare agents is prohibited by various international treaties. During World War I, increasingly toxic lachrymatory agents were used.