Second-hand smoke is harmful to the health of babies, mainly harming the baby’s respiratory system, digestive system, nervous system and blood system. 1. Respiratory system: the baby’s resistance is relatively weak, the respiratory mucosa resistance to second-hand smoke is poor, second-hand smoke will stimulate the respiratory mucosa inflammation, the child is prone to respiratory tract infections. 2. Digestive system: babies who often inhale second-hand smoke have weakened digestive functions and are prone to picky eating, anorexia, bloating and diarrhea. Heterocyclic amines and aromatic amines in secondhand smoke inhibit the secretion of digestive juices and reduce gastrointestinal function. 3. Nervous system: Nicotine, heterocyclic amines and benzo(a)pyrene in secondhand smoke will stimulate the central nervous system of children, which is not conducive to the development of the brain and nerves, and makes it easy for them to grow up with a poor memory, poor concentration, and unable to keep up with the teacher’s rhythm in school. 4. Blood system: carbon monoxide, sulfur gas and hydrogen cyanide and other volatiles in second-hand smoke may inhibit the hematopoietic system, which is a high-risk factor for anemia and leukemia in children. So for the sake of your child’s health, try to stay away from tobacco, and not smoking benefits yourself as well as your family and friends.