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Difino
| • | A chemical weapon agent (CWA) is a chemical substance whose toxic properties are used to kill, injure or incapacitate. About 70 different chemicals have been used or stockpiled as chemical weapon agents during the 20th century. These agents may be in liquid, gas or solid form. In general, chemical weapon agents are organized into several categories according to the manner in which they affect the human body. The names and number of categories varies slightly from source to source, but in general, types of chemical warfare agents are as follows: Source: [wikipedia: list of chemical weapon agents]
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