Smoking on the chances of pregnancy deformities need to be combined with the specific circumstances, the general smoking pregnant women to give birth to deformed fetus risk for normal pregnant women 2 times to 3 times.
Nicotine and other components in cigarettes can reach the fetus through the placenta, so active or passive smoking during pregnancy will affect intrauterine development of the fetus, and even lead to developmental malformations and other adverse consequences. At this stage, there is no accurate data on the risk of giving birth to a deformed fetus in women who smoke, but it is clear that the risk of giving birth to a deformed fetus in a woman who smokes is about two to three times higher than that of a woman who does not smoke.
In conclusion, cigarettes contain many substances that have an adverse effect on fetal growth and development, and the probability of smoking affecting malformations in pregnancy has not yet been clearly established. Therefore, in order to achieve the goal of eugenics, women should avoid active and passive smoking during pregnancy. The early stage of pregnancy is a critical period for the development of the fetal nervous system and is also the most susceptible period, requiring extra attention.