Pregnancy while a woman has been smoking can have an impact on the normal development of the fetus, so she needs to undergo regular relevant screening tests, and if the fetus is normal, she can rest assured that she can nurture it. If the fetus is normal, the pregnancy should be terminated promptly. If you want to keep the fetus, you should quit smoking immediately, have Down’s syndrome screening at 14-19 weeks of pregnancy, 4D ultrasound at 22-26 weeks of pregnancy to rule out abnormalities, and if necessary, amniocentesis at 16-20 weeks to check the condition of the fetus. Try to avoid exposure to harmful substances during the day. Take folic acid on time to reduce the probability of fetal malformation. Also pay attention to keep your mood happy, don’t have too much stress and build up your confidence. A large amount of nicotine, tar, acetone and other toxic substances inside tobacco can enter the blood circulation of the fetus through the placenta after being completely absorbed by the respiratory mucosa, which can easily affect the intelligence and emotion of the fetus, and then lead to developmental incompleteness, developmental malformations and other adverse consequences.