RF radiation cannot and will not cause cancer. No matter how many hundreds of watts you get exposed to. That much RF can cause burns through the excitation of water molecules in our bodies, but its on the wrong end of the spectrum to cause the kind of damage needed to cause cancer.
I cannot tell you how tired I am of people thinking radio waves can cause cancer. 6th grade science will teach you that its fundamentally impossible.
Since I'm so nice, heres a handy chart to illustrate:
Ionizing = Cancer causing, non-ionizing = no cancer
Here's an interesting observation about cosmic rays. Wait and read it when you're on a plane. It'll be more fun.
http://news.spaceweather.com/rads-on-a-plane-may-oct-2015/