E-cigarettes are harmful to the body. E-cigarettes are electronic products that imitate cigarettes, which have the same appearance, smoke taste and feel as cigarettes, and are a product that allows users to smoke after turning nicotine and other substances into vapor through atomization and other means. The World Health Organization has conducted a study specifically on e-cigarettes concluded that e-cigarettes are harmful to public health and are not a means of quitting smoking, and must be better managed to eliminate harm to youth and non-smokers. Studies have shown that people using e-cigarettes in addition to nicotine, but also may be other undiscovered toxic compounds inhaled into the body, while e-cigarettes can also be as harmful to the health of people around second-hand smoke, it will be released into the room can be inhaled liquid fine particles and ultra-fine particles, nicotine and carcinogens. Because e-cigarettes do not produce smoke, it is easy to mislead consumers into thinking it is safe and healthy, which is a false perception.