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The electronic cigarette: what does science say?

IRIS Prévention
2 September 2026
The electronic cigarette divides. Rather than opinions, let's look at what science establishes, with nuance and caution.

Electronic cigarettes, or vaping, have become a subject of debate. Some see it as an aid to quitting smoking, others are concerned about its risks. What does science really say? Without deciding everything, it is possible to take stock of current knowledge, with the nuance that the subject requires.

1. How it works

The electronic cigarette heats a liquid, usually containing nicotine, to produce an inhaled vapor. Unlike cigarettes, there is no combustion of tobacco, therefore no smoke or tars resulting from this combustion, the main causes of tobacco damage.

2. A tool to help you stop?

Several health authorities consider that vaping can help certain people quit smoking, by providing nicotine and reproducing the action. For a smoker, switching to electronic cigarettes is considered less harmful than continuing to smoke, although it is not without risk.

#B2DFDB;color:#374151;vertical-align:top;background:#F4FBFA">May help some smokers
PointWhat we remember
Vs smoked tobaccoConsidered less harmful
Safe?No, caution needed
Non-smokersNot recommended if you don't smoke not

3. What we know about the risks

The electronic cigarette is not harmless, and there is still a lack of perspective on its very long-term effects. The current consensus is that it is less harmful than smoked tobacco for a smoker, but that it is not recommended for non-smokers, particularly young people, in whom it can initiate dependence.

4. A nuanced approach

For a smoker looking to quit, the electronic cigarette can be an option, ideally as part of a supported approach aimed at completely stopping, including vaping in the long term. For a non-smoker, there is no reason to start.

    • For a smoker: less harmful option than continuing to smoke
    • For a non-smoker: not recommended, do not start
    • Ideally as part of a supported approach to stopping completely

Talking about it with a health professional allows you to make an informed choice, adapted to your situation.

💡 tips to remember

    • The electronic cigarette does not involve the combustion of tobacco, therefore no smoke or tar, the main causes of tobacco damage.
    • For a smoker, switching to vaping is considered less harmful than continuing to smoke, although not without risk.
    • It can help some smokers quit, ideally in a supported approach aimed at complete cessation.
    • There is a lack of perspective on the very long-term effects: it is not trivial and calls for caution.
    • For a non-smoker, particularly a young person, it is not recommended: there is no reason to start.