[nonbel]

Of course, that seems to be exactly what is going on:

>"These considerations of mechanism suggest that at chronic doses close to the toxic dose, any chemical, whether synthetic or natural, and whether genotoxic or nongenotoxic, is a likely rodent and human carcinogen. Not all chemicals would be expected to be carcinogens at high doses; the MTD may not be reached (101) or the chemical may be toxic without causing cell killing or mitogenesis."

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC54830/