About Electronic Cigarettes (E-Cigarettes)
- E-cigarettes have the potential to benefit adults who smoke and who are not pregnant if used as a complete substitute for regular cigarettes and other smoked tobacco products.
- E-cigarettes are not safe for youth, young adults, pregnant adults, as well as adults who do not currently use tobacco products.
- While e-cigarettes have the potential to benefit some people and harm others, scientists still have a lot to learn about whether e-cigarettes are effective in helping adults quit smoking.
- If you’ve never smoked or used other tobacco products or e-cigarettes, don’t start.
- Additional research can help understand long-term health effects.
E-cigarettes are not safe for youth, young adults, and pregnant women, as well as adults who do not currently use tobacco products.
- E-cigarettes come in many shapes and sizes. Most have a battery, a heating element, and a place to hold a liquid.
- E-cigarettes produce an aerosol by heating a liquid that usually contains nicotine—the addictive drug in regular cigarettes, cigars, and other tobacco products—flavorings, and other chemicals that help to make the aerosol. Users inhale this aerosol into their lungs. Bystanders can also breathe in this aerosol when the user exhales into the air.
- E-cigarettes are known by many different names. They are sometimes called “e-cigs,” “e-hookahs,” “mods,” “vape pens,” “vapes,” “tank systems,” and “electronic nicotine delivery systems (ENDS).”
- Some e-cigarettes are made to look like regular cigarettes, cigars, or pipes. Some resemble pens, USB sticks, and other everyday items. Larger devices such as tank systems, or “mods,” do not resemble other tobacco products.
- Using an e-cigarette is sometimes called “vaping.”
- E-cigarettes can be used to deliver marijuana and other drugs.
Some e-cigarettes are made to look like regular cigarettes, cigars, or pipes.
Some resemble pens, USB sticks, and other everyday items.
The e-cigarette aerosol that users breathe from the device and exhale can contain harmful and potentially harmful substances, including:
- Nicotine
- Ultrafine particles that can be inhaled deep into the lungs
- Flavoring such as diacetyl, a chemical linked to a serious lung disease
- Volatile organic compounds
- Cancer-causing chemicals
- Heavy metals such as nickel, tin, and lead1
It is difficult for consumers to know what e-cigarette products contain. For example, some e-cigarettes marketed as containing zero percent nicotine have been found to contain nicotine.2
What is in e-cigarette aerosol?
Yes—but that doesn’t mean e-cigarettes are safe. E-cigarette aerosol generally contains fewer toxic chemicals than the deadly mix of 7,000 chemicals in smoke from regular cigarettes.3 However, e-cigarette aerosol is not harmless. It can contain harmful and potentially harmful substances, including nicotine, heavy metals like lead, volatile organic compounds, and cancer-causing agents.1
E-cigarettes are not currently approved by the FDA as a quit smoking aid. The U.S. Preventive Services Task Force, a group of health experts that makes recommendations about preventive health care, has concludedexternal icon that evidence is insufficient to recommend e-cigarettes for smoking cessation in adults, including pregnant adults.3
However, e-cigarettes may help non-pregnant adults who smoke if used as a complete substitute for all cigarettes and other smoked tobacco products.
- To date, the few studies on the issue are mixed. A Cochrane Reviewexternal icon found evidence from two randomized controlled trials that e-cigarettes with nicotine can help adults who smoke stop smoking in the long term compared with placebo (non-nicotine) e-cigarettes.4 However, there are some limitations to the existing research, including the small number of trials, small sample sizes, and wide margins of error around the estimates.
- A recent CDC study pdf icon[PDF–197 KB] found that many adults are using e-cigarettes in an attempt to quit smoking.5 However, most adult e-cigarette users do not stop smoking cigarettes and are instead continuing to use both products (known as “dual use”).7 Dual use is not an effective way to safeguard your health, whether you’re using e-cigarettes, smokeless tobacco, or other tobacco products in addition to regular cigarettes. Because smoking even a few cigarettes a day can be dangerous,6 quitting smoking completely is very important to protect your health.
E-cigarettes are the most commonly used tobacco product among youth.
- In the United States, youth are more likely than adults to use e-cigarettes.
- In 2020, 3.6 million U.S. middle and high school students used e-cigarettes in the past 30 days, including 4.7% of middle school students and 19.6% of high school students. This represents a decrease from 2019.8
- In 2019, 4.5% of U.S. adults were current e-cigarette users.9
- In 2019, among current adult e-cigarette users overall, 36.9% also currently smoked cigarettes, 39.5% formerly smoked cigarettes, and 23.6% had never smoked cigarettes.9
- Among current adult e-cigarette users, the percentage who have never smoked cigarettes is highest among those aged 18–24 years (56.0%), and is lower in older age groups. 9
- Guide for quitting smoking: Provides free resources, including a mobile app and quit guide.
- E-cigarette, or Vaping, Products Visual Dictionary pdf icon[PDF – 3 MB]: This product is intended for educational purposes only for public health officials and healthcare providers. The devices and brands presented in this pamphlet are intended to highlight the different e-cigarette, or vaping, product generations and substances used in these devices.
- Federal regulation of e-cigarettes: Provides an overview of FDA regulations of e-cigarettes and other tobacco products.external icon
- Information for parents, caregivers, and influencers of youth and young adults about e-cigarettesexternal icon: Features comprehensive information about the impact of e-cigarette use among young people, and includes resources such as a tip sheet for parents to talk to their teens about e-cigarettes.
- State laws and policies regarding e-cigarettes: This CDC fact sheet reports on laws pertaining to sales, use, and taxation of e-cigarettes in the 50 states and the District of Columbia.
- Surgeon General’s Report on E-cigarette Use Among Youth and Young Adults pdf icon[PDF–8.47 MB]external icon: Released in 2016, this is the first report issued by a federal agency to comprehensively review the public health issue of e-cigarette use among youth and young adults. The report’s scientific findings are based on the best available evidence regarding a variety of topics, including trends in e-cigarette use; health effects of e-cigarettes, nicotine, and secondhand e-cigarette aerosol; e-cigarette marketing and advertising; and evidence-based strategies to reduce e-cigarette use among youth and young adults.
CDC has provided this material for your information. It is not intended to substitute for the medical expertise and advice of your primary health care provider. We encourage you to discuss any decisions about medication with your health care provider. The mention of any product, service, or therapy is not an endorsement by CDC.
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- US Department of Health and Human Services. E-cigarette use among youth and young adults: a report of the Surgeon General pdf icon[PDF–8.47 MB]. Atlanta, GA: US Department of Health and Human Services, CDC; 2016.
- Goniewicz ML, Gupta R, Lee YH, et al. Nicotine levels in electronic cigarette refill solutions: a comparative analysis of products from the U.S., Korea, and Poland. Int J Drug Policy. 2015;26(6):583–588.
- Patnode CP, Henderson JT, Thompson JH, Senger CA, Fortmann SP, Whitlock EP. Behavioral Counseling and Pharmacotherapy Interventions for Tobacco Cessation in Adults, Including Pregnant Women: A Review of Reviews for the U.S. Preventive Services Task Force. Evidence Synthesis No. 134. AHRQ Publication No. 14-05200-EF-1. Rockville, MD: Agency for Healthcare Research and Quality; 2015.
- Hartmann-Boyce J, McRobbie H, Bullen C, Begh R, Stead LF, Hajek P. Can electronic cigarettes help people stop smoking, and are they safe to use for this purpose?external icon Published 13 September 2016.
- Caraballo RS, Shafer PR, Patel D, Davis KC, McAfee TA. Quit Methods Used by US Adult Cigarette Smokers, 2014–2016external icon. Prev Chronic Dis 2017; 14:160600.
- Bjartveit K, Tverdal A. Health Consequences of Smoking 1-4 Cigarettes Per Day. Tobacco Control 2005;14(5):315–20.
- QuickStats: Cigarette Smoking Status Among Current Adult E-cigarette Users, by Age Group — National Health Interview Survey, United States, 2015external icon. MMWR Morb Mortal Wkly Rep 2016;65:1177.
- Wang TW, Neff LJ, Park-Lee E, et al. E-cigarette Use Among Middle and High School Students — United States, 2020. Morbidity and Mortality Weekly Report, 2020;69.
- Cornelius ME, Wang TW, Jamal A, Loretan C, Neff L. Tobacco Product Use Among Adults – United States, 2019. Morbidity and Mortality Weekly Report, 2020. Volume 69(issue 46); pages 1736–1742. [accessed 2020 November 19].
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