Because of the high temperature heating of the oil smoke will produce benzopyrene carcinogen, long-term inhalation can induce lung tissue cancer. Current research shows that cooking on cookware with poor ventilation systems and very low combustion efficiency can cause damage to health equivalent to smoking two packs of cigarettes a day. Therefore, experts recommend that women who like to cook, do not wait until the kitchen fumes to open the hood, must be opened when firing the hood. After stir-frying, let the hood smoke for 3-5 minutes to completely absorb harmful substances.