E-cigarettes are indeed harmful to the body because the e-liquid in e-cigarettes will release Nicotine and other chemicals that may have negative effects on the body. In addition, the design and manufacture of e-cigarettes may also have flaws that cause the gases and smoke released from e-cigarettes to have adverse effects on health. Although e-cigarettes may be safer than traditional cigarettes, they are still a dangerous substitute and should be used with caution. If you plan to use e-cigarettes, be sure to follow the manufacturer's guidelines and recommendations and pay attention to the safety and hygiene of e-cigarettes.