A poisoning that is caused by exposure to sulfur mustard. The effects of mustard poisoning may be local, systemic, or both, depending on environmental conditions, exposed organs, and the extent and duration of exposure. The toxic effects of mustard include inhibition of mitosis, NAD depletion, decreased tissue respiration and finally cell death. [ MONDO:patterns/patterns/poisoning https://orcid.org/0000-0001-7151-1615 ]