Yes, some bakeware can leach toxins such as PTFE, PFOA, or PFOS.  If you are concerned about cooking safely, you may want to learn more about what these chemicals are and how they can be detrimental to your health.  If you are seriously concerned about the possibility of adding chemical toxins into your food, consider purchasing bakeware that is known to be nontoxic.  Here is a reference list: Toxic Bakeware: • Aluminum pans • Ceramic-coated pans • Copper pans • Silicone • Non-stick pans Non-toxic Bakeware: • Cast Iron pans • Enameled Cast Iron pans • Glass • Stainless Steel