As we all know, smoking is harmful to health, and studies have shown that secondhand smoke can also cause lung cancer. Harmful chemicals released by burning tobacco can cause great damage to the human body, and patients with respiratory illnesses are prone to recurring illnesses due to secondhand smoke. In order to be able to give birth to a healthy baby, women should avoid inhaling second-hand smoke, if someone around you is smoking, please go to a smoke-free area as far as possible, and if you are preparing for the mother’s smoking, it is best to quit smoking, to prevent the occurrence of fetal malformations. In addition, also need to pay attention to is, after the tobacco burning not only do not inhale second-hand smoke, but also to prevent third-hand smoke. What is third-hand smoke, that is, nicotine in the form of vapor present in clothing, hair, the harm is no less than smoking second-hand smoke.