Vaping vs Smoking: Health Comparison Explained

Updated 10 November 2026

This article has been checked against published public health evidence but has not been independently reviewed by a medical professional.

Is vaping safer than smoking? For an existing smoker, switching completely to a nicotine vape substantially reduces exposure to many harmful chemicals produced by burning tobacco. However, vaping is not harmless, and scientists do not yet know the long term effects of prolonged use. 

This guide compares the evidence, explains the remaining uncertainties and provides links to free NHS support. It is general health information, not individual medical advice.

Vaping vs smoking: the main differences

Sources: 

NHS vaping to quit smoking

OHID's 2022 evidence update

Why burning tobacco causes more harm

Cigarettes burn tobacco. The resulting smoke contains thousands of harmful chemicals, including carbon monoxide and other substances known to cause cancer. Smoking damages blood vessels and lung tissue and increases the risk of chronic obstructive pulmonary disease (COPD), heart attacks, strokes and several cancers.

A vape uses electrical heating instead of burning tobacco. Its vapour can contain nicotine, propylene glycol, vegetable glycerine, flavouring ingredients and substances formed during heating. That avoids many products of tobacco combustion, but it does not make the inhaled vapour equivalent to clean air. Poorly controlled heating, unsuitable liquids and defective products can increase exposure to unwanted compounds.

The distinction is therefore between a much lower-risk exposure and a well-established high-risk exposure, not between a dangerous product and a completely safe one.

What the evidence says:

NHS guidance: less harmful, not harmless

The NHS vaping guidance states that nicotine vaping is less harmful than smoking and that vapes can help you quit. It also stresses that children and non-smokers should never vape, the long-term effects are uncertain and the full benefits of switching require stopping cigarettes completely.

OHID review, 2022: lower exposure to toxicants

The Office for Health Improvement and Disparities (OHID) reviewed international evidence in September 2022. It found that biomarkers of exposure to many harmful substances were substantially lower in people who vaped instead of smoking. However, some findings were mixed, and exposure to certain substances was higher in vapers than in people using neither product.

The review considered the widely repeated estimate that vaping is 95% less harmful to remain broadly consistent with the short and medium term evidence. It nevertheless recommended the less easily misinterpreted description that vaping carries a small fraction of the risks of smoking. The 95% figure is not a measurement of a person's lifetime cancer, heart or lung disease risk, and should not be advertised as an exact guarantee.

Cochrane review, 2026: evidence on stopping smoking

The 2026 Cochrane review of electronic cigarettes for smoking cessation examined studies available up until 1 January 2026. It found high-certainty evidence that nicotine e-cigarettes increased successful quit rates at six months or longer compared with nicotine replacement therapy (NRT), such as patches or gum.

The review did not detect evidence of serious short term harm from regulated nicotine vapes used in the studies, but longer and larger trials are needed to assess safety. Quit rate evidence does not prove that vaping is safe for non-smokers or establish its effects after decades of exposure.

What changes when someone switches completely?

Stopping cigarettes removes the repeated exposure to smoke from burning tobacco. In people who switch fully, studies have measured lower levels of several tobacco related toxicants, including those associated with carcinogen exposure. Carbon monoxide exposure from cigarettes can fall quickly after smoking stops.

Some people report less coughing or improved breathing after giving up smoking. However, individual symptoms vary, and vaping itself can irritate the throat. It would be misleading to promise that a particular vape will improve health, reverse existing disease or prevent cancer. Those outcomes require individual assessment and appropriate long-term evidence.

The difference between complete switching and dual use matters greatly. Someone who vapes but still smokes several cigarettes each day remains exposed to tobacco smoke. The NHS advises stopping smoking entirely. See the separate vaping versus smoking cost comparison for financial considerations.

The health risks of vaping that remain

Nicotine dependence

Nicotine is addictive. It can produce withdrawal symptoms such as cravings, irritability, poor concentration and interrupted sleep when exposure falls. Nicotine can also temporarily affect heart rate and blood pressure. Most of the severe long-term harm from cigarettes comes from other chemicals in smoke rather than nicotine alone, but this does not make nicotine a reason for non-smokers to start using vapes.

Zero nicotine e-liquids remove the nicotine exposure, not all possible risks of inhaling vapour. For people reducing nicotine after quitting smoking, the nicotine strength guide explains strengths and device compatibility.

Respiratory irritation and chemical exposure

Vaping can cause coughing, dry mouth, throat irritation and other unwanted effects. Vapour can contain fine particles, flavouring derived compounds and sometimes metals from device components. The amount varies by product and how it is used. Current evidence does not establish the complete risk of prolonged exposure over several decades.

Batteries and product defects

A damaged lithium-ion battery can overheat or catch fire. Use suitable charging equipment, never charge a damaged device and keep e-liquids out of reach of children and pets. If you experience a suspected adverse reaction or identify a defective vape device, you can report it through the MHRA Yellow Card scheme.

Who should not start vaping?

Children, teenagers and people who do not smoke should not vape. Nicotine exposure is a particular concern in younger people, and taking up vaping without a smoking history offers no smoking related harm reduction benefit. For someone who is pregnant and smokes, stopping cigarettes is vitally important. NHS maternity guidance generally favours licensed nicotine replacement therapy with professional support; vaping may be less risky than continuing to smoke, but pregnancy specific evidence is limited. See NHS stop smoking in pregnancy for more.

If you smoke: three practical steps towards stopping cigarettes

Step 1: 

Get support and choose a plan. Contact a free local Stop Smoking Service. An adviser can discuss your cigarette use, previous attempts to stop and options including NRT, stop-smoking medicines and vaping. The NHS guide to finding the right vape also explains basic vape devices. The guide to choosing a vape covers equipment features but doesn’t making medical claims about individual brands.

Step 2: 

Aim to stop smoking completely. If you decide to use a vape, choose an appropriate nicotine strength so that cigarette cravings are mitigated. Some people switch straight away; others require more preparation. NHS guidance advises using the replacement often enough to avoid returning to cigarettes. 

Step 3: 

Stay smoke free before reducing nicotine. Once your cigarette cravings are under control and you are confident you will not relapse, consider gradually reducing nicotine strength. There is no need to rush into stopping vaping if doing so risks restarting cigarettes. Use the NHS guide to quitting vaping only when ready.

Myths vs facts: vaping health claims checked

Where to get free help to stop smoking

In England, use the NHS Find your local Stop Smoking Service page. Services offer free support and can help with treatment choices. Depending on your local authority, the government-funded Swap to Stop programme may also offer eligible adult smokers access to vape-based support. Availability varies by area. 

For further guidance, see NHS vaping to quit smoking and NHS how to quit vaping. The NHS page also directs readers in Scotland, Wales and Northern Ireland to their own national support services.

How do I stop vaping after quitting smoking?

First establish that you can stay smoke free. When ready, reduce nicotine strength gradually, increase the time between vaping or create totally vape free times. 

Equipment information for adults already using nicotine

Device choice should be based on compatibility, maintenance and use, not unproven claims that a particular product treats addiction or prevents disease. The following links provide perfect starting points: 

Vape starter kits 

Pod kits 

10ml e-liquids

Nicotine salts

Examples of different devices include:

Innokin Endura T18e

Aspire PockeX AIO

Uwell Caliburn G4 Mini

Vaporesso XROS 3 Mini

Final assessment

Smoking causes well established, serious disease because tobacco burns and produces toxic smoke. For an adult who smokes, complete switching to regulated nicotine vaping greatly lowers exposure to many of those harmful substances. The most useful next step for a smoker is to get help to stop cigarettes completely. For a non-smoker, there is no reason to begin vaping. When someone has successfully switched and feels confident of staying smoke free, reducing and eventually stopping vaping is a reasonable longer term goal.

Frequently asked questions

Is vaping safer than smoking?

For adults who smoke, fully replacing cigarettes with nicotine vaping substantially reduces exposure to many harmful smoking related chemicals. It is not risk-free, and long-term health effects remain uncertain. People who do not smoke gain no benefit from starting.

What does the NHS say about vaping to quit smoking?

The NHS recognises nicotine vaping as an effective option for adults trying to stop smoking, particularly with behavioural support. Its advice is to choose sufficient nicotine to manage cravings and stop using cigarettes completely. See the official NHS links above.

Is vaping addictive?

Nicotine vapes can cause dependence and withdrawal symptoms. Nicotine free products avoid nicotine dependence but are not necessarily free of inhalation risks. If you are planning to reduce use, follow NHS advice.

Should non-smokers start vaping?

Absolutely not. The NHS advises that children, young people and non-smokers should not vape. The potential reduction in smoking related harm only applies when someone is moving away from an existing smoking habit.

Does vaping cause popcorn lung?

Cancer Research UK reports no confirmed cases of bronchiolitis obliterans, commonly called popcorn lung, linked to e-cigarette use. Diacetyl, the chemical often mentioned in this claim, is prohibited in regulated UK nicotine e-liquids. 

Evidence and sources

NHS: Vaping to quit smoking

OHID: Nicotine vaping in England, 2022 evidence update

Cochrane: Electronic cigarettes for smoking cessation, 2026 update

NHS: Vaping myths and facts

Cancer Research UK: Does vaping cause popcorn lung?

NHS: Stop smoking in pregnancy

NHS: How to quit vaping

MHRA: Yellow Card reporting for e-cigarettes