One of the chemicals that's commonly added to foods is the preservative sodium benzoate. Just how much food would you have to eat before that chemical killed you? It's tough to say exactly, but it's safe to conclude that the only real threat is if you get hit by a truck hauling sodium benzoate.
Our society is woefully illiterate on scientific matters. Yet instead of taking the opportunity to educate customers about the benefits of food science, some companies have chosen to cash in on public ignorance.