It doesn't come close. The EPA consistently overrates these threats to legitimize their power.
Well, Dioxins and similar compounds are prevalent in the environment; but usually not naturally occurring. “Mostly Deadly” is sort of meaningless without context. I would say the accumulated risk of long term exposure of minute quantities via use of industrial products of all sorts is the concern. It’s not like someone is going to jump into a vat of known carcinogens.