Epidemiology didn't prove smoking causes cancer, btw. It cannot

It doesn't prove causation. I agree.

It did show an 18% increase in risk for colorectal cancer in those that eat processed meat. It's small and maybe future studies might overturn it. But why take that risk now?

Hormesis is heavily debated. what doesn't kill you generally makes you very sick.

I think you do believe in certain forms of hormesis like exercise. If you look at its immediate effects, it breaks down your muscles, increases bp, stresses your liver, kidneys, bones etc. But as you recover you super compensate by growing bigger muscles, more efficient circulation and metabolism etc. Exercise makes you live better and longer. (I think carnivores also believe that)

It's the same with other environmental and psychological stresses. It been demonstrated in studies too. It's all about Context, recovery and dosage.