Smoking by women has certain effects on pregnancy, which may cause fetal malformation, and in severe cases, stillbirth may occur. Since tobacco contains tar, nicotine, carbon monoxide, and other harmful ingredients, if a woman smokes for a long time during pregnancy, it may have a certain impact on the growth and development of the fetus, which may lead to malformations, and in serious cases, may lead to fetal heart stoppage and stillbirth. Therefore, pregnant women not only need to prohibit smoking during pregnancy, but should also avoid second-hand smoke. During preparation for pregnancy, prolonged smoking will affect the quality of the eggs, resulting in decreased chances of conception, difficulty in getting pregnant, and even if the pregnancy is successful, fetal malformation may also occur. Women should avoid active smoking and secondhand smoke both during preparation and pregnancy. In your daily life, you need to ensure sufficient rest time, do not overwork, and eat a diet rich in vitamins and proteins.