

There’s a lot of things that are toxic at high levels but the typical volume avaliable commercially is never going to work, you need some kind of refined to the toxic elements only type of substance that is at least possible no one’s even figured out how to do that as there’s no sense in it.
Licorice is not that common a spice any more, partially because it’s toxic at pretty obtainable levels, though people who like the flavor still typically won’t accidentally consume a dangerous amount.