(Please note: This interview originally aired back in September.) It's scary, but by now it's also obvious -- our environment today contains thousands (literally, thousands) of toxic chemicals that it did NOT contain just a few decades ago. How are these chemicals affecting our health? And what can we do about this? Our guest on ST Medical Monday is the co-author of a new book called "Non-Toxic: Guide to Living Healthy in a Chemical World." Dr. Aly Cohen is a board certified rheumatologist and integrative medicine specialist, as well as an environmental health expert based in Princeton, New Jersey.