E-cigarettes have adverse effects on pregnant women, whether actively smoking e-cigarettes or passively smoking secondhand e-cigarettes, the normal development of pregnant women and fetuses are very harmful for the following reasons: 1, the nicotine content of e-cigarettes is very high, e-cigarettes are liquid nicotine through the atomizer atomization and inhaled into the lungs, so there is no difference with the smoking of ordinary cigarettes. Nicotine is very harmful to the respiratory system, the nervous system and the cardiovascular system, and is also a relatively accurate carcinogenic substances; 2, because of the short history of e-cigarettes, safety has not been scientifically proven, so there are many unknown factors on pregnant women and fetal adverse effects; 3, e-cigarettes also contain a large number of propylene glycol, easy to the normal respiratory mucosa to form irritation, thus It is easy to cause respiratory diseases, which can cause hypoxia in pregnant women, thus affecting the normal development of the fetus, and even cause fetal arrest in serious cases.