1, not easy to give birth to a boy According to the April 20, 2002 issue of the British medical journal “The Lancet” published the results of a study showed that couples who smoke before the woman’s conception will greatly reduce the likelihood of having a boy. Scientists in Japan and Denmark conducted a smoking survey of 5,372 mothers from December 2000 through July 2001 and a long-term birth sex survey of more than 11,000 babies born at his clinic. For those parents where neither smoked, the study found 121 boys for every 100 girls born. But if the parents smoked more than 20 cigarettes a day, the ratio dropped to just 82 boys for every 100 girls born. In addition, in cases where only the father smoked, the study found that for every 100 baby girls born, there were only 98 baby boys. Currently, scientists cannot determine why smokers are less likely to have boys. But they suspect that the chromosome-carrying sperm that determines the birth of a boy are more susceptible to the effects of cigarettes, and cigarettes also reduce the likelihood of egg fertilization. 2, sperm motility decreased, affecting the important reason for having a boy Some infertility patients, very sensitive to the toxins in tobacco, especially in the testicles of spermatogenic cells are more susceptible to toxin hazards, so that sperm reproduction growth retardation, insufficient number and swimming speed is reduced. Data show that nicotine in tobacco can reduce the secretion of sex hormones (testosterone) and spermicide, where 30 cigarettes a day smokers, sperm survival rate of only 49% (mortality rate of 51%). If non-smokers and smokers have equal chances of conception, then the possibility of smokers’ spouses to conceive is reduced by half. 3, smoking caused by sperm deformity rate increases, an important cause of infertility rising year by year Some scholars observed 120 cases of smoking for more than 1 year and 50 cases of non-smokers as a control, and found that the rate of abnormal sperm in the semen is related to the amount of smoking per day: more than 31 cigarettes per day, the risk of sperm morphology abnormality almost doubled; smoking history of more than 10 years compared with the smoking history of a shorter period of time, the quality of semen is significantly The quality of semen is significantly different and the rate of abnormality is significantly higher when compared to those who have smoked for more than 10 years. The relationship between smoking and sperm deformities was described in a famous British medical journal, which pointed out that the average sperm count of smokers is about 10% lower than that of non-smokers. The more cigarettes smoked per day, the higher the incidence of deformed sperm, the longer the smoking history, the more deformed sperm, and the number of normal sperm decreases, mobility is also reduced, the husband smoking can also make the fetal mortality rate increased. Evans on 43 cases of smokers and 43 cases of non-smokers sperm morphology observation, non-smokers for 57.7 ± 1.8%; smokers for 52.9 ± 1.47%. Among the three types of sperm malformations: head, body and tail, double-headed malformed spermatozoa were more common. Smokers malformed sperm rate and the relationship between the amount of daily smoking, scholars pointed out that there is a 5% difference between smokers who smoke 1-10 cigarettes and 11-20 cigarettes a day, 21-30 cigarettes a day, sperm deformity history rate that is significantly higher, but there is little difference between smokers who smoke more than 31 cigarettes a day. Heavy smokers, smokers long their sperm deformity rate significantly higher. 4, smoking DNA damage caused by sperm Smoking to sperm DNA damage mechanism: (1) smoking smoke inhalation of the human body, which nicotine and other harmful substances, can affect the maturation and reproduction of spermatogenic cells, so that sperm mutation; (2) burning smoke can inhibit sperm power enzyme system, so that sperm motility declined; (3) smoking on the human body’s endocrine system has a great impact on the scholars found that the plasma endotestosterone of smokers is not as high as it used to be in the blood. Scholars have found that the plasma testosterone concentration of smokers has decreased (the amount of testosterone in the testes is 200 times higher than that in the blood) because of smoking, resulting in a decrease in the ability of testosterone secretion by the interstitial cells in the testes and a decrease in the secretion of testosterone, which fails to maintain an internal environment with a high concentration of testosterone to ensure that spermatozoa develop and grow.