From the Personal Journal of Dr. Howard Fine:
Perhaps one of the silliest of the countless woozles and wutzits I’ve encountered over these years is the Moh’ko, a solitary, beetle-like creature whose diet consists entirely of the mucus found in the respiratory tracts of primates.
Though mostly harmless to almost all but the very young or the elderly, the Moh’ko’s insatiable hunger has seen it evolve the ability to stimulate the production of mucus by means not yet fully understood.
That said. There is little-to-no evidence to support the claim that the Moh’ko is also responsible for the actions of those individuals inclined to ingest their own mucus.