Does a microwave let out enough radiation to eventually cause cancer? from where on the microwave does the most radiation come out when microwaves on?

It just doesn't: Microwaves produced wavelengths of radiation that don't damage the genes, which must happen to cause cancer. Everything gives off radiation -- light, your own body warmth, and dangerous x-rays. There are many types and most are harmless. The world is full of crooks posing as humanitarians, and you need to be discerning. Thanks for your question.