For several years, headlines have repeated the idea that e-cigarettes are 95% safer than smoking. That figure has often been misunderstood, overstated, or taken out of context. This updated article explains what the evidence actually says, where the “around 95%” figure comes from, and why modern public health guidance is more careful in how it frames the risks of vaping vs smoking.
The short version is this: vaping is substantially less harmful than smoking, but it is not harmless, and it is not intended for people who have never smoked, especially children and young people.
Where the “95% Less Harmful” Figure Comes From
The often-quoted figure comes from a landmark review and evidence review published by Public Health England in 2015. That review of the evidence concluded that e-cigarettes are around 95% less harmful than smoking tobacco, based on toxicological comparisons between cigarette smoke and vapour from electronic cigarettes.
At the time, this work was published by Public Health England (PHE), which was then the government’s executive public health agency. Since 2021, PHE has been replaced by the Office for Health Improvement and Disparities, with smoking and vaping policy now sitting under the Department of Health and Social Care.
The original conclusion was never that vaping is safe or risk-free. It was that e-cigarettes carry a fraction of the risk compared with smoking cigarettes, which exposes users to thousands of harmful chemicals created by combustion.
What “Less Harmful Than Smoking” Actually Means
When experts say vaping is less harmful than smoking, they are comparing relative harm, not declaring vaping safe.
Cigarette smoke is created by burning tobacco. That process produces tar, carbon monoxide, and many toxic compounds that cause cancer, heart disease, and lung disease. The risk of smoking comes primarily from inhaling smoke, not from nicotine itself.
By contrast, e-cigarettes heat a liquid to create vapour without the harmful products of combustion. That is why the evidence consistently shows vaping to be substantially less harmful than smoking and significantly less harmful to health when compared with cigarettes.
However, vaping still involves inhaling substances into the lungs. That is why public health bodies are careful to say it is less harmful than tobacco, not harmless.
What Current Public Health Bodies Say Today
The NHS continues to state that vaping is less harmful than smoking and can help adult smokers quit smoking. NHS guidance is clear that people who already smoke may benefit from switching, particularly when supported by local stop smoking services.
At the same time, the NHS also emphasises that:
- Vaping is not recommended for people who have never smoked
- Children and young people should not take up vaping
- Long-term health risks are still being studied
This aligns with later evidence review published after the original PHE report and reflects a more cautious, balanced position.
Evidence Reviews and Academic Support
Subsequent reviews, including work involving King’s College London, have broadly supported the conclusion that vaping is harmful to health than tobacco smoking and that e-cigarettes are significantly less harmful when compared with cigarettes.
A comprehensive review of the evidence finds that while vaping carries potential health risks, those risks are far lower than the harms caused by smoking. In other words, vaping may still pose health risks, but smoking remains far more dangerous.
Nicotine, Addiction and Smoking Cessation
One area that often causes confusion is nicotine. Nicotine is addictive, but it is not the primary cause of smoking-related disease. The biggest harms from cigarette smoking come from inhaling smoke from burning tobacco.
That is why nicotine vaping products can help smokers stop smoking. They deliver nicotine without the harmful smoke, reducing exposure to toxins while addressing cravings.
For adult smokers, using e-cigarettes can be an effective smoking cessation tool, especially when combined with behavioural support from stop smoking services.
Risks of Vaping and What We Still Don’t Know
While vaping is less harmful than smoking, it is not risk-free. The risks of vaping include:
- Ongoing nicotine dependence
- Exposure to some harmful chemicals (at much lower levels than smoke)
- Uncertainty around very long-term use
This is why public health guidance stresses that vaping is a harm-reduction tool for smokers—not a lifestyle product for non-smokers.
Youth Vaping and Public Health Concerns
A major concern today is youth vaping. Public health authorities are clear that vaping should not become a route into smoking for children or young people.
Evidence so far suggests that vaping is less harmful than smoking, but there are concerns that it may normalise nicotine use or lead to people taking up tobacco smoking later. That is why regulations focus heavily on preventing under-18 access and reducing appeal to children.
So, Is Vaping Safer Than Smoking?
Based on the current evidence, the answer for adult smokers is yes: vaping is safer than smoking and substantially less harmful than smoking cigarettes.
But the full picture matters:
- Vaping is less harmful, not harmless
- It is intended for smokers trying to quit
- It is not for non-smokers or under-18s
That distinction is central to modern UK public health messaging.
Final Word: Evidence Over Headlines
The claim that e-cigarettes are 95% safer than smoking comes from a real evidence review, but it was never meant as a blanket endorsement. It was a comparison of harm relative to smoking tobacco.
Today’s guidance from the NHS and public health bodies reflects that nuance. Vaping is less harmful than smoking, can help reduce health inequalities linked to smoking, and plays a role in smoking cessation—but it should be used responsibly, by the right people, for the right reasons.
If you smoke, switching completely to vaping is likely to reduce your health risks. If you don’t smoke, the safest option remains not to start at all.