Arsenic is a chemical compound, close to a metal, that was found, before the ban on its use, in numerous insecticides, raticides, fungicides and herbicides. It was also used as a gaseous chemical weapon. At a weak dosage, arsenic is found in certain cancer treatments, notably those for leukemia. However, its usage is very limited due to its toxicity. Exposure to arsenic may cause vomiting, diarrhea with the presence of blood, abdominal pain, and death.