Whether he died or not is irrelevant. He GOT cancer and I think OP’s suggestion that it was environmental is plausible. That he was rich is only significant because he DIED from the cancer, but he died because he refused modern medicine and thought he could diet the cancer away.

Companies get away with exposing us to a lot more harm than just toxic waste, e.g., tire and break dust is everywhere; cheap plastic packaging on everything we eat and drink.

Perhaps fruits and vegetables contaminated with microplastics were a factor.