I have read and heard articles and podcasts by the engineers who used to make them who could explain why they are harmful. I didn't really pay attention until I kept hearing from 3, 4 5, 6, 7. Yes, the leaching of heated plastic is even worse. When I hear from doctors dealing with cancer and auto-immune patients, most are my age (56 or older). They talk about accumulated problems in the body. "now their kidneys don't work. Then they do this and the liver doesn't filter anything. They're already 50 pounds overweight, and they have blood sugar problems". I don't use it and I ask my family members not to use it when I'm in the kitchen. In my opinion, we have enough toxins and problems in our modern society without adding more. Yes, cell phones are also convenient, but if you have one next to your ear for many minutes each day, I don't think that helps either.