The effects of smoking on fertility include the possibility of abnormal fetal development, preterm labor, low birth weight babies, infertility, etc., which is very harmful. Smoking is a bad habit and prolonged smoking not only increases the chances of respiratory diseases, but may also have some adverse effects on fertility. If a woman smokes for a long period of time, it may affect the quality of the egg cells, leading to infertility, or the quality of the embryo, leading to abnormal fetal development. Smoking during pregnancy may affect the function of the placenta, which may affect the growth and development of the fetus, leading to the occurrence of low-birth-weight babies or preterm labor. If a man smokes for a long time, it may affect the spermatogenic function of the testes, which may lead to higher sperm deformity rate and lower vitality, which may lead to male infertility.