This product contains wood dust, a substance known to the State of California to cause cancer. In addition, combustion of wood pellets, like wood products, result in the emission of carbon monoxide, soot and other combustion by-products which are known by the State of California to cause cancer, birth defects, or other reproductive harm. Use a dust mask or other safeguards to avoid inhaling wood dust or wood combustion by-products.www.P65Warnings.ca.gov