I lately hear that if you cook olive grease at a hi heat the grease breaks down and may explanation Cancer?

I lately hear that if you cook olive grease at a hi heat the grease breaks down and may explanation Cancer?
True. If you heat grease past it's smoking heat, it causes free radical, which are linked to cancer. If you want to cook at high roast, use canola, peanut or vegetable oil. Olive grease has a low smoking heat.
Olive oil does fine up to atmosphere high roast. But the extra virgin olive oil will break down below moderate heat.