Yes. This group of chemicals are not biodegradable but stay in the environment for decades as they accumulate. They cause cancer and disrupts variety of other biological functions from low birth weights to thyroid, kidneys, liver and immune system. This chemical group permeates the entire eco system’s animals and plants. The important thing to remember is they have been used since the 1950s, they accumulate in your body, they impede biological function and they are carcinogenic.