The use of Blister Agents has been known for more than 150 years. Blister agents are the most common chemical warfare agents and are also known as vesicants. There are five known vesicants, which are: sulfur mustard (HD), nitrogen mustard (HN), lewisite (L), lewisite mixture (HL), and phosgene oxime (CX). The two best-known vesicants are sulfur mustard, also known as mustard gas, and lewisite. Sulfur mustard was once claimed to be the blistering agent most commonly associated with warfare and was, in fact, the leading cause of chemical casualties during World War I, even though it was only used during the final year of the war. (Smith, 2002). Sulfur mustard was first introduced from Germany in 1917. It caused 88% of deaths and was a major factor in that specific disease that affected much of that specific geographic location. Sulfur mustard was also used during the Iraq-Iran War which took place from 1984 to 1987. During the Iraq-Iran War, there were between 40,000 and 150,000 casualties due to chemical munitions. (Newmark, 2007). Sulfur mustard is a blistering chemical agent that does not immediately affect the body. It has a period of one to eight hours in which a person can be affected. Depending on the duration of exposure to sulfur mustard will determine how long it will take for a person to heal from this exposure. It is imperative that medical personnel who handle victims of sulfur mustard protect themselves because they too can become victims. There are a few reasons why sulfur mustard gas has been used in many cases. First of all it was very effective. Secondly, it forced the enemy to wear the necessary protective equipment. Thirdly, by forcing the enemy to wear some or additional protective equipment, this affects the mid-card countries. I believe that with the current technology and capabilities of so many countries, it is nearly impossible to determine how in-depth their studies are. Works Cited https://www.osha.gov/SLTC/emergencypreparedness/guides/blister.html Fire, F. ( 2008). Blister agents: phosgene oxime. 161(7), 122-125. doi: 0015-2587 Military Medicine. February 2007, vol. 172 Issue 2, p196-198. 3p.Military psychology (Taylor & Francis Ltd). April 2002, vol. 14 Issue 2, p145-157. 13p.Smith, W. (2002). Vesicant agents and anti-blister medical countermeasures: clinical toxicology and psychological implications. 14(2), 145-157. Retrieved from http://web.a.ebscohost.com/ehost/detail?sid=2fc2fe83-3779-49ce-86ef-5f2ed9b0edc3@sessionmgr4005&vid=1&hid=4114&bdata=JnNpdGU9ZWhvc3QtbGl2ZQ==#db=mth&AN=6705502Taylor Jr. , LBL ( 1992). Chemical and biological warfare. (Rev. ed. ed., pp. 26-29).