Electronic second-hand smoke is as harmful to pregnant women as traditional cigarettes, and may lead to miscarriage, high blood pressure in pregnancy, and cause fetal malformations, etc., and must be avoided as much as possible in the course of pregnancy. The main component of electronic cigarettes is water vapor, which also contains nicotine, so it produces the same toxic and harmful substances as traditional cigarettes. If you are exposed to electronic second-hand smoke for a long period of time, the nicotine in the air may enter the fetus, leading to fetal malformation or causing miscarriage. And pregnant women living in secondhand smoke for a long time will increase the risk of pregnancy hypertension. Even with e-cigarettes, the smoke they produce can still have an effect on pregnant women, so pregnant women should try to stay away from secondhand smoke environments to avoid the adverse effects of passive smoking on themselves and their fetuses.