If you think about the actual process it doesn't really make a lot of sense to me. Once the material enters the mouth saliva containing enzymes begins to break down the plant including the urushiol that causes the reaction. Once it enters the stomach then it's in contact with hydrochloric acid, potassium chloride and sodium chloride that make up gastric acid. I have no idea what happens to the urushiol under those conditions but I have to believe some chemical changes are taking place along the way. My luck, I'd break out from entry to exit.
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