Women are not advised to smoke during pregnancy preparation, nor should they smoke, smoking has an effect on pregnancy preparation. Firstly, smoking will reduce the probability of natural pregnancy. If a woman smokes for a long time, the probability of natural pregnancy will be significantly reduced. Secondly, smoking increases the probability of fetal development malformations, as nicotine in cigarettes is a harmful substance that can cause fetal development malformations. Therefore, you should not smoke during the preparation period or during pregnancy. Thirdly, women who smoke for a long time are significantly more likely to suffer from gestational hypertension and liver disease during pregnancy. Therefore, whether from the perspective of the fetus or from the safety of the pregnant woman herself, you should not smoke during pregnancy preparation and pregnancy.