China’s tobacco industry is very prosperous, “men do not smoke, living in vain”, China has a quarter of male smokers. However, they may not know that tobacco contains more than 1,200 kinds of harmful substances, in addition to the widely known nicotine, there are hydrocyanic acid, ammonia, carbon monoxide, pyridine, aromatic compounds and smoke tar, etc., of which nicotine, carbon monoxide and polycyclic aromatic hydrocarbons are the most harmful to pregnant women and the fetus. If a woman is addicted to smoking, it is likely to cause menstrual disorders and reduce the likelihood of conception. Tobacco toxins act on the pregnant mother, can pass through the placenta directly endangering the developing embryo, so that the rate of chromosomal aberrations in fetal somatic cells increases, especially in the early embryonic development of this sensitive period. Fetal chromosomal aberrations are closely related to miscarriage, stillbirth, multiple malformations, and congenital diseases. Tobacco toxins also interfere with fetal development, increasing the incidence of intrauterine growth retardation and greatly increasing the likelihood of giving birth to children younger than the gestational age. Children of pregnant women who smoke not only have poor growth and development, but are also prone to intellectual, emotional and behavioral deficits. In addition, pregnant women who smoke are more likely to have anemia and are more likely to have insufficient breast milk after delivery. Some studies have found that: the birth rate of low-birth-weight babies in pregnant women who smoke is twice as high as that of non-smoking women; the risk of preterm labor is 2.9 times higher in pregnant women whose husbands smoke than in those whose husbands don’t smoke; the risk of premature rupture of membranes is 3 times higher in pregnant women whose husbands smoke than in those whose husbands don’t smoke; and the risk of asphyxiation of the newborn is 3.3 times higher in pregnant women whose husbands smoke than in those who don’t smoke. So does second-hand smoke have any effect on pregnant women? We know that the harmful substances in tobacco are spread with the air, and when the father smokes, the mother and the fetus are forced to follow the “second-hand smoke”, which is as harmful as when the mother smokes. The passive smoking of pregnant women will also lead to trace elements zinc and cadmium metabolism obstacles, the emergence of “low zinc and high cadmium” adverse situation. Trace elements zinc is a beneficial element to the fetus, its participation in the body of many enzymes, and even affect the chromatin structure and gene expression, lack of zinc often triggers a number of diseases, and cadmium in the smoke is extremely unfavorable to pregnant women, the fetus, can change the function of the various metabolic acids in the placenta, thus making the embryonic death, malformation, intrauterine developmental delays, embryonic insufficiency of incidence increases Male smoking is also Men’s smoking is also very harmful. Nicotine has the effect of lowering the secretion of sex hormones and killing sperm, and the harmful substances of tobacco and its metabolites can cause genetic mutation of male sperm or mutation of genes controlling sperm production, leading to sperm deformity. Malformed sperm or poor quality sperm can lead to abnormal fetal development after conception. Medical studies have found that the rate of teratogenicity is four times higher in fathers who smoke than in non-smokers. Some people call tobacco as eugenics “killer”, is not excessive. At the same time, smoking has a greater impact on sperm motility. Recent studies have also found that a husband’s smoking can reduce his wife’s likelihood of conception by half.