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Cyanide is one of the best known of all poisons. Perhaps best known as the suicide pills reputedly carried by secret agents it was also the active ingredient in the gas (Zyklon B) used by the Nazis in extermination camps such as Auschwitz.
Types of chemical agent. The toxic component of a chemical weapon is called its âchemical agent.â Based on their mode of action (i.e. the route of penetration and their effect on the human body), chemical agents are commonly divided into several categories: choking, blister, blood, nerve and riot control agents.he toxic component of a chemical weapon is called its âchemical agent.â Based on their mode of action (i.e. the route of penetration and their effect on the human body), chemical agents are commonly divided into several categories: choking, blister, blood, nerve and riot control agents.