It may not be as bad for you as it seems, although it may be socially looked down upon. Dried nasal mucus, pieces of which are colloquially known as boogerst, is commonly found in one's nose and is a result of drying of the normally viscous colloidal mucus. Stefan Gates in his bookGastronaut discusses the action of the consumption of dried nasal mucus. Because the function of mucus is to filter airborne contaminants, a natural question is whether the consumption of which is unhealthy. Gates comments that "our body has been built to consume snot," because the nasal mucus is normally swallowed after being moved inside by the motion of the cilia. Friedrich Bischinger, a lung specialist at Privatklinik Hochrum in Innsbruck, claims that nose-picking combined with nasal mucus eating is beneficial for the immune system. His reasoning is backed by the fact that our immune system is able to deal with pathogens we have encountered before by building antibodies to the foreign bacteria that got into our system in the first place, similar in idea to how a some preventative vaccines works. He therefore states "In terms of the immune system the nose is a filter in which a great deal of bacteria are collected, and when this mixture arrives in the intestines it works just like a medicine."