The following fan theories are about Acid secretion.
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|Acid secretion functions by manufacturing abnormal quantities of hydrochloric acid in the stomach, transporting it through the bloodstream, and secreting the acid through the skin.
||+ Hydrochloric acid is highly corrosive, capable of dissolving flesh and damaging/destroying a variety of other substances. By producing large quantities of stomach acid and transporting the excess through the bloodstream (or even specialized channels), one could logically secrete acid.|
+ Hydrochloric acid produces acidic fumes as it reacts with matter. This would explain the smoke which often billows from the objects Cushing corrodes (seen here, here, and here.)