Inhaling peptides is not a vaccine unless they are using an adjuvant. You need something to kick off the immune response and recognize the peptides as associate

Inhaling peptides is not a vaccine unless they are using an adjuvant. You need something to kick off the immune response and recognize the peptides as associated with a pathogen, otherwise you’d be getting immune responses to everything you inhale in the environment (like when you cook). And if they are using adjuvants, well then as others have posted.. autoimmune issues can be real. It’s not that it’s not possible... just something you might want to try on a mouse before up your nose. Why oh why experiments on yourself or suggest this to others without lots of warnings?