Smoking even just one cigarette a day during pregnancy can have negative effects on your baby's development. The chemicals in cigarettes, such as nicotine and carbon monoxide, can restrict oxygen and nutrient supply to the fetus, leading to potential growth problems and increased risk of preterm birth. It can also increase the chances of complications like low birth weight and developmental issues. Quitting smoking altogether is the best option for both you and your baby's health. If you are struggling to quit, seek support from healthcare professionals who can provide guidance and resources tailored to your needs.