You should not smoke in the first month of pregnancy, smoking in early pregnancy is likely to increase the risk of miscarriage and fetal malformation, it is recommended not to smoke throughout pregnancy, the harmful substances in tobacco will directly affect the growth and development of the mother and fetus. 1. 2, the impact on the fetus: tobacco contains a variety of harmful substances, the most harmful is tar, nicotine, carbon monoxide, such harmful substances may be transferred to the fetus through the placenta, affecting the growth and development of the fetus, may cause fetal growth retardation, congenital developmental malformations, such as cleft lip and palate, congenital heart disease, etc., serious In some cases, the fetus may suffer from intrauterine hypoxia and stillbirth. Therefore, for the sake of your baby and your own health, it is not recommended to smoke during the first month of pregnancy or during the entire pregnancy, and to avoid passive smoking as much as possible. If you smoke in early pregnancy, you should first quit smoking, take folic acid supplements, pay attention to regular maternity checkups and screening for teratology, and if necessary, visit a prenatal diagnosis center and ask your doctor to evaluate whether you can continue the pregnancy in the context of the fetus.