They look similar and get lumped together, but heated tobacco and vaping are fundamentally different products. Here’s how they actually compare — and why “which is worse” doesn’t have a tidy winner.
Quick answer: The core difference is the ingredient: heated tobacco (IQOS) heats real tobacco leaf; a vape heats a tobacco-free e-liquid. Both avoid combustion and both deliver addictive nicotine, so both are widely considered less harmful than smoking for adults who fully switch — but they’re chemically different, with different risk questions, and there’s no clear scientific consensus on which is worse. Heated tobacco carries tobacco-specific toxicants (at lower levels than cigarettes); vaping carries open questions about long-term aerosol exposure to the lungs. For a non-smoker, the answer is simple: neither.
General information, not medical advice. Not for non-smokers or under-21s.
The fundamental difference
- Heated tobacco (HNB / IQOS): a holder heats an actual tobacco stick to below ~350°C. The aerosol comes from tobacco, so it includes tobacco-specific chemicals — including tobacco-specific nitrosamines — though at lower levels than burning a cigarette.
- Vaping: a coil heats a liquid of propylene glycol, vegetable glycerin, flavourings and nicotine. There’s no tobacco leaf at all; the risk questions are about the e-liquid chemistry and the heated aerosol reaching the lungs.
So they’re not two versions of the same thing. One is a tobacco product that avoids burning; the other is a tobacco-free nicotine product.
How the risks compare
| Heated tobacco (IQOS) | Vaping | |
|---|---|---|
| Contains tobacco | Yes | No |
| Combustion | No | No |
| Nicotine / addiction | Yes | Yes |
| Tobacco-specific toxicants | Present (lower than cigarettes) | Largely absent |
| Lung-aerosol questions | Some | More studied, still open |
| Quit-smoking evidence | Limited | Stronger (Cochrane: vapes beat NRT) |
| Regulatory status | Tobacco product | Often consumer/tobacco product |
| Long-term disease data | Immature | Immature |
Both sit below smoking on the risk ladder for a complete switcher, and both sit above not using nicotine at all. Where they differ is type of risk, not a clean ranking — which is exactly why no major health body declares one definitively safer than the other.
Which should a smoker choose?
If you’re an adult smoker deciding between them as a way off cigarettes, the practical points are: vaping has the stronger quit-smoking evidence (high-certainty Cochrane data shows nicotine vapes outperform patches and gum — see does vaping help you quit smoking?), while heated tobacco keeps a closer cigarette-like ritual that some smokers find easier to switch to. Either way, the goals are the same: switch completely (dual use erases the benefit), and treat it as a step toward stopping nicotine, not a permanent habit. If you don’t smoke, don’t take up either.
FAQ
Is heated tobacco worse than vaping?
There’s no clear consensus. Heated tobacco contains tobacco-specific toxicants (lower than cigarettes); vaping has more-studied but still-open lung-aerosol questions. Both are considered less harmful than smoking for complete switchers and both deliver addictive nicotine.
Is IQOS or vaping better for quitting smoking?
Vaping has the stronger evidence base for quitting (high-certainty Cochrane data shows nicotine vapes beat traditional nicotine-replacement therapy). Heated tobacco’s cigarette-like feel suits some switchers, but its cessation evidence is weaker.
Is IQOS a vape?
No — IQOS heats real tobacco (heated tobacco), while a vape heats tobacco-free e-liquid. They’re different product types.
Which is safer, IQOS or vaping?
Neither is established as safer than the other; both are less harmful than smoking for a full switcher but not safe, and neither is appropriate for non-smokers.
General information, not medical advice. To stop smoking, speak to a healthcare professional or your local stop-smoking service.