The American Academy of Allergy Asthma and Immunology disagrees, which I'm surprised by and totally thought they could too. Someone linked to this in another thread.

> What can occur is that the patient smells an allergen, and that smell triggers a strong memory of a past reaction or the fear of having a reaction and signs and symptoms of panic may occur – including an increase in heart rate, tight breathing, flushing of the skin and nervousness, all of which could be mistaken as signs and symptoms of anaphylaxis. ... While smells can linger in the air, the allergen proteins do not, which is why smelling a food will not trigger anaphylaxis.

Interestingly some allergens like those in shellfish /can/ aerosolize in a boiling pot, however according to them peanuts cannot. I can still absolutely see airlines reacting to passengers thinking they're having attacks and eliminating peanut snacks out of caution and to avoid the issues even an imagined attack can cause on a flight. That and the risk of surface contamination probably?

https://www.aaaai.org/tools-for-the-public/conditions-librar...

edit: dang scooped by 5 minutes.

That is not true:

https://www.aaaai.org/allergist-resources/ask-the-expert/ans...

I took a flight inside Mexico (Mexico City to Oaxaca) recently and the in-flight service snack was bagged peanuts. I was so amused, it was almost shocking to see. And, good news, no one died, but I assume if it was on a plane in US there probably would've been a strong emotional reaction by at least one person. It's good to know that the "Airborne anaphylaxis" is not a thing.

My buddy's gf is allergic to peas.

She visited a friend's house and started getting an itchy throat immediately. Friends knew of her allergy and obviously hadn't prepared any.

Turned out the dog food had peas in it and the bag was open on the other end of the house in the kitchen. (And a supporting role from whatever the dog had slobbered on in the living room)

Sometimes it blows me away how sensitive our bodies can be.