There is currently no consensus among e-cigarette manufacturers and officials as to whether e-cigarettes are as effective or more effective in helping quit smoking as nicotine replacement therapy. So far, the US Food and Drug Administration (FDA) has not approved e-cigarettes as an auxiliary tool for quitting smoking. Although e-cigarettes may not expose users to all toxic substances generated by tobacco combustion, the characterization of health risks associated with exposure to electronic smoke aerosols is not yet clear. This means that the reduced harm caused by smokers switching to e-cigarettes should be weighed against the potential risks faced by non-smokers who believe that e-cigarettes are more attractive and safer than cigarettes. Some countries, including Brazil, India, and Uruguay, have banned the sale of all e-cigarettes or products containing nicotine. The European Union has set a regulatory limit of 20mg/mL for nicotine in electronic liquids to prevent the release of nicotine from e-cigarettes from exceeding the standard cigarette dosage. In the United States, e-cigarettes and other electronic nicotine delivery systems (ENDS) fall under the scope of the Tobacco Control Act. The FDA made this decision in the "Recognition Rules" that came into effect on August 8, 2016 (which means that ENDS is deemed to be bound by the Act). At that time, all brands of e-cigarettes in the market must obtain FDA approval before being launched; However, no manufacturer complies with this regulation. In other words, all ENDS products sold at that time should be considered illegal sales. At the time of writing, there was still no actual FDA approval for ENDS products in the market. Initially, the FDA issued a warning letter to the manufacturer, but no further action was taken. As the rate of young people smoking e-cigarettes begins to soar, the situation has changed. In January 2020, the FDA announced the start of implementing the bill. Due to the lack of any electronic liquid in the market that meets regulations, the company is allowed one month to remove the product from the shelves. If manufacturers wish to resume sales, they must submit a pre market tobacco product application to the FDA before May 12, 2020. These applications must provide 'scientific data that can prove that the product is suitable for protecting public health'. The e-cigarette manufacturer replied that the regulatory actions for e-cigarettes are complex and require a balance between protecting non-smokers from harm and reducing the harm to existing smokers. Smokers who completely switch to e-cigarettes are exposed to lower levels of certain carcinogens and other toxic substances, "said Gideon St. Helen, assistant professor of medicine at the University of California, San Francisco, 90109. This reduces the risk of some tobacco related diseases and may be beneficial for public health, "other experts agree with this consideration, although the net impact of e-cigarettes on public health in the long term depends on demographic data and future population growth. For example, when the birth rate continues to increase, priority may be given to reducing the risk of adolescents, which may be different from the consideration given to the increasing proportion of elderly people who smoke for life.