We have 5 year old a pizza stone that use to make homemade pizzas, pita bread, etc...
For as long as I can remember every time we preheat it in the oven (before adding any food on it) it produces a huge amount of smoke. The oven is clean.
Depending on what we're using it for the temperature varies, but on average I'd say ~400°F. I'm not 100% sure of the stone material, but I would guess Cordierite because it looks similar to this stone.
Is there anyway to prevent the smoke?