IL17A and lung disorder: Other Th17-related cytokines, including IL-17a, IL-1β, IL-23, and IL-6, were also elevated in the blood of sulfur mustard-exposed subjects with an inverse correlation with %FEV1 [27,28] Hence, dysregulation of the Th17/Treg axis is a potential pathway common to both flavoring-related lung disease and mustard lung disease.