I just came across a fantastically interesting book: Food Hypersensitivity by Isabel Skypala and Carina Venter.

Did you know that sulphite (metabisulphite) sensitive people can possibly get a reaction just by inhaling sulphur dioxide generated during swallowing? That might mean that even TASTING high sulphite wines (or other beverages) could trigger a reaction like rash or wheezing!