Cigarettes and old Nalgene bottles: both are hazardous. (Nalgene began phasing out water bottles with BPA in 2008. This photo, by Regan Walsh, was taken in 2007.)

The BPA in your water bottle may be even more dangerous than you think.

A major new paper is raising the alarm about low-level exposure to endocrine disruptors, substances like bisphenol A (BPA) and phthalates that interfere with hormones in the human body. These endocrine-disrupting chemicals, or EDCs, are found in a vast array of everyday products like plastics, household cleaners, cosmetics, pesticides, upholstery, and paper receipts.