The peanut allergy hysteria narrative says that I can't eat peanuts on a plane or in a classroom with somebody who's allergic because the mere odor of peanuts might kill them. If there is any shred of truth to that narrative (which I seriously doubt), then perhaps trace peanut dust in a home from adults eating crunchy peanut-based snacks is enough early exposure to inhibit an allergic reaction.
My uncle doesn't topple over dead from the smell of peanuts, but he can't be in the house while peanut butter cookies are baking or he will get a bad/dangerous reaction. I suppose there's likely people with worse allergies than him.
