What isn’t known about the relationship between exposure regimes and poor outcomes could fill the complete OED. Is it really a hormesis model? Linear No Thresho

What isn’t known about the relationship between exposure regimes and poor outcomes could fill the complete OED. Is it really a hormesis model? Linear No Threshold? Linear? Supra-linear? Linear-quadratic? We don’t know, and generally speaking it would be unethical to try and find out using humans.