Nerve gases generally cause death by asphyxiation. The symptoms preceding this include blurred vision, runny nose, tightness in the chest and constriction of the pupils. The victim will next have difficulty breathing, and will experience nausea and drooling. As the victim continues to lose control of his bodily functions, he will involuntarily vomit, defecate and urinate. This phase is followed by twitching and jerking, and the victim will lapse into a coma and suffocate as a consequence of convulsive spasms.
Yet certain types of nerve gas can penetrate the skin, including VX, tabun and sarin. While it may take longer to absorb this way, these types can still lethally poison if the gas touches the skin.
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