Even if some infinitesimal amounts of gluten are inhaled it’s inconsequential for persons with celiac disease because the amount will never reach the minimal threshold of 10 mg per day needed to cause harm. In addition, inhaling is not ingesting. Gluten needs to reach the small intestine to be toxic for persons with celiac disease. Inhaling gluten is only an issue if one spends a significant amount of time in an environment where gluten-containing flour is airborne, such as a bakery. June, 2013