Smoking while pregnant can harm your unborn child. Nicotine and other chemicals from cigarettes can restrict blood flow to the placenta, reducing oxygen and nutrient supply. This increases the risk of low birth weight, premature birth, and developmental problems. Smoking during pregnancy can also lead to complications such as miscarriage, stillbirth, and sudden infant death syndrome (SIDS). The harmful effects can continue even after birth, with increased risks of respiratory issues, asthma, and infections. It is crucial to quit smoking as soon as possible to protect your baby's health.