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Chemical warfare means using chemical compounds in war to injure or kill people. The chemicals used for chemical warfare are poisonous.

Chemical warfare has been used since the Stone Age^{[verification needed]}. Since 1899, several international laws have said that using chemical weapons is illegal. But chemical weapons have still been used in wars since then.^[1]^[2]

↑ Article 23. wikisource.org. Retrieved September 14, 2013.
↑ (July 29, 1899). Laws of War: Laws and Customs of War on Land (Hague II); Article 23. yale.edu. Retrieved September 14, 2013.