Re: Fugu/Pufferfish. No, Yoshi, people thought it tasted so damn good and keep eating it even after knowing someone dropped dead because of it, and the shogun had to ban the fish from consumption to prevent that kind of stupid death from happening. Eventually someone figured out how to prepare it safely (probably the common citizens who aren't restricted, because the ban was only for the upper class samurai).
shouldnt there be at least one person out there with a natural immunity? EVERY person who lives in this world is allergic to crap peaches?
I mean, as explained in the manga allergic reaction is caused by an otherwise-healthy immune system overreacting. So if all standard person get sick from those peaches and the solution to fix that is to lower your immune system, that means that only people who have weaker immune system (i.e. sickly people) would be naturally resistant against the effects.