1. Sulphur mustard is a known carcinogen. A study of American soldiers exposed to sulphur mustard during World War I revealed an increased incidence of lung cancer (and chronic bronchitis) compared to soldiers who had sustained other injuriesA study of British workers involved in the production of sulphur mustard during World War II revealed no increase in deaths due to cancer amongst those who had died since 1945, but an increase in the prevalence of laryngeal carcinoma amongst those still alive. Some solid tumours take 20 years or more to develop, and although there has been no increase in rates, the long term effects in mustard casualties from the Iran/Iraq war are awaited