Pregnancy preparation requires smoking cessation, as excessive smoking may affect the quality of sperm and eggs, and even affect embryonic development. Smoke contains a lot of harmful substances that are harmful to the human body after inhalation, such as nicotine in tobacco, which has the effect of inhibiting hormone secretion and killing sperm, preventing the combination of sperm and eggs, reducing the chances of conception and causing menstrual disorders and miscarriage. And smoking can cause coronary heart disease, hypertension, cerebrovascular disease and peripheral vascular disease, long-term smoking can cause damage to the bronchial mucosa cilia, shortening, affecting the cilia removal function, thus causing chronic bronchitis, emphysema and chronic airway obstruction and other diseases. Long-term heavy smoking may even cause cancer and increase the risk of cancer, so smoking is harmful to your health and you need to quit smoking during the preparation period. In addition to quitting smoking and drinking during the preparation period, you should also pay attention to rest, don’t work too hard, keep your mood happy, avoid exposure to toxic and harmful substances, radiation, etc., and don’t take medicine indiscriminately. It is also necessary to take folic acid supplements in advance during the first three months of pregnancy to promote embryonic development and prevent fetal malformations.