Although the legislation initially allowed the FDA to regulate cigarettes, roll-your-own tobacco, and smokeless tobacco, regulatory authority has since been expanded to include nearly all tobacco products (such as hookah and pipe tobacco) as well as other emerging devices such as e-cigarettes and nicotine gel packs
Wassberg Johnson, Sarah (2023) Are Nutrition Science and Nutritional Guidelines Racist? Food History Blog, March 24, 2023
In the example, nasal cells should be exposed to higher concentrations while alveolar cells should be exposed to lower concentrations as due to the anatomical location, less compounds will reach such structures
Secretory IgA doesnt directly kill microbes, but it prevents them from triggering a damaging immune response before they can be cleared by other mechanisms
There was some good news in the study, however