If an unwanted pregnancy is discovered after smoking all the time, it is not recommended to continue the pregnancy from the eugenic point of view and it is recommended to terminate the pregnancy as soon as possible. Tobacco contains harmful substances such as nicotine and carbon monoxide, which may have adverse effects not only on the body of the adult, but also on the fetus. If the ultrasound determines that the pregnancy is intrauterine and the gestational sac is not particularly large, you can choose to terminate the pregnancy by medical abortion or abortion. The success rate of medical abortion is not high, but the damage is relatively small, and the success rate is generally around 60%-70%. If you are planning to have children, it is best to quit smoking six months in advance.