Smoking during pregnancy is considered lethal not only to the mother but also to the unborn baby inside her womb. Smoke from cigarettes contains tobacco, which severely affects pregnancy. Even if a pregnant woman does not smoke, exposure to tobacco smoke (secondary smoking) can cause harm. Smoking causes miscarriages and preterm births. Tobacco smoke interferes with the proper growth and development of a fetus and may cause complications and disorders, such as low birth weight and respiratory problems. It is important to avoid tobacco smoke to increase the chances of a safe pregnancy and ensure the birth of a healthy baby.