Cigarettes contain obvious toxic substances, including nicotine, which may cause malformations in fetal development. Secondhand smoke during pregnancy may also lead to fetal malformations. If you have been smoking since the beginning of your pregnancy and throughout your pregnancy, it is important to have a detailed obstetric examination and, if necessary, an amniocentesis. Cigarette smoking is harmful in many ways, as it may cause problems in the development of fetal tissues and organs, and may also affect the fetal nervous system, leading to intellectual or limb movement problems or defects in the child after birth. If it is now late in pregnancy and the fetus detects no problems with development, delivery can be considered. It is best to quit smoking as soon as possible, too much smoking is also harmful to the mother and tends to increase the incidence of lung cancer.