It safe to eat food that has been left in a oven when gas is on but not lit?

It is never safe to eat food that has been left in an oven with the gas on but not lit. When the gas is on, it is possible that the food could become contaminated with carbon monoxide, which is a poisonous gas. Even if the food does not taste or smell bad, it could still be contaminated with carbon monoxide and should not be eaten.