Though it’s non-ionizing, there is a paper out there about DNA resonance at mmW and THz. So I suppose you can still get cellular damage. So a single photon is

Though it’s non-ionizing, there is a paper out there about DNA resonance at mmW and THz. So I suppose you can still get cellular damage. So a single photon is not ionizing, but I can certainly generate plasmas with lots of photons at lower energy. So the whole point of ionizing radiation is that it can induce cellular damage without killing the cell? So this can’t be done with non-ionizing radiation, even though it can certainly ionize with average energy?