If smell was legit warning trigger and not a learned trigger nobody would eat balut.
Don’t google that if you’re easily barfed.
Not sure my objections are entirely based on its effect on my olfactory senses. Someone told me they sell more balut in the far east, then we sell burgers in the west, I don’t know if it’s true, but it does seem to be very popular, who knows why.
“Thousand year old eggs”, yeah, big deal in the Far East, but then fugu is more of a sport than a meal. There’s no accounting for taste.