Is IQOS TEREA Less Harmful Than Cigarettes? What the Science Actually Says (UAE 2026)
| IQOS TEREA generates significantly fewer harmful combustion by-products than cigarettes — but it is not safe, and it has not been proven to reduce the risk of disease. What the evidence shows: ✓ IQOS produces ~96% fewer polycyclic aromatic hydrocarbons (PAHs) than cigarettes — confirmed by the French National Cancer Institute (INCa/IResP) study, 2026. ✓ IQOS produces ~98% less carbon monoxide than cigarettes — CO is a major cause of cardiovascular damage from smoking. ✓ The U.S. FDA authorized IQOS as a Modified Exposure tobacco product in 2020 — meaning it reduces exposure to some harmful chemicals compared to cigarettes. ✗ The FDA did NOT authorise IQOS as a ‘Modified Risk’ product — meaning it cannot be marketed as reducing the risk of tobacco-related disease. ✗ IQOS aerosol still contains harmful compounds including formaldehyde, acrolein, and glycidol — some not found in cigarette smoke. ✗ Nicotine content is comparable to cigarettes — both products are addictive. Bottom line: IQOS TEREA exposes users to fewer combustion by-products than cigarettes. Whether this translates to reduced disease risk for individuals remains scientifically unproven. Quitting tobacco entirely is the only choice with confirmed health benefit. |
‘Is IQOS TEREA less harmful than cigarettes?’ is one of the most searched questions about heated tobacco products in the UAE in 2026 — and one of the most inconsistently answered. Retailer websites say yes. Tobacco control organisations say the evidence is inconclusive. Philip Morris International’s own clinical program claims significant risk reduction. Independent researchers point out important gaps in that claim.
All of these positions are partly right. And none of them is the complete picture.
This guide presents what the science actually shows — the real data from PMI’s clinical studies, the actual ruling of the U.S. Food and Drug Administration (the world’s most rigorous tobacco regulator), findings from independent studies including a 2026 French National Cancer Institute comparison, and what the honest answer to the harm question looks like when you read the evidence without either retailer optimism or activist pessimism distorting it.
It is written for adult smokers in Dubai and the UAE who have decided to switch from cigarettes and want to understand what they are switching to — not for people who have never smoked. IQOS TEREA is a tobacco product. It is not risk-free. It is not a quitting tool. This article does not advocate for its use by non-smokers.
Table of Contents
1. How IQOS TEREA Works — Why the Heating Process Matters to the Harm Question
| THE KEY DIFFERENCE: COMBUSTION VS HEATINGA conventional cigarette burns tobacco at 800–900°C. Combustion at this temperature produces over 6,000 chemical compounds — many of which are toxic, and at least 70 of which are known carcinogens. The smoke you inhale from a cigarette is fundamentally a product of burning. An IQOS ILUMA device heats a Terea stick to approximately 350°C — well below the temperature at which tobacco combusts. Because there is no burning, many of the combustion-specific compounds found in cigarette smoke are not formed. This is the scientific basis for all reduced-harm claims associated with IQOS. |
The distinction between combustion and heating is not marketing language — it is a real physical process with measurable chemical consequences. When tobacco burns, a cascade of chemical reactions occurs that would not happen at 350°C. Carbon monoxide, polycyclic aromatic hydrocarbons, and many other compounds are products of this high-temperature combustion process — not of tobacco itself.
However — and this is equally important — heating tobacco to 350°C still produces chemical compounds. Tobacco is a complex organic material. Heating it, even without combustion, still releases nicotine, some aldehydes, trace amounts of formaldehyde, and other compounds. The question is not ‘does IQOS produce harmful compounds?’ — it does. The question is ‘does it produce fewer and at lower levels?’ — and here, the evidence is more consistent.
2. What Philip Morris International’s Studies Show
Philip Morris International has conducted the most extensive clinical program ever assembled for a tobacco product, submitting its data to the U.S. FDA for review. PMI’s own data — drawn from in vitro studies, animal studies, and human clinical trials — shows:
- Average 90–95% reduction in levels of harmful and potentially harmful compounds (HPHCs) compared to cigarettes, across the majority of the 58 compounds tested.
- Significant reduction in biomarkers of exposure — biological markers that indicate how much of specific harmful chemicals entered users’ bodies. Smokers who fully switched to IQOS showed levels closer to those of people who quit entirely, compared to those who continued cigarettes.
- Improvements in selected biomarkers of potential harm — including arterial stiffness measurements (AIx), which improved in IQOS users compared to cigarette smokers, suggesting less cardiovascular impact.
- Reduced inflammation markers — some clinical studies showed improvements in lung inflammation markers in switched users compared to continuing smokers.
| PMI CROSS-SECTIONAL CLINICAL STUDY — KEY FINDING PMI’s published clinical program concluded: ‘Adult smokers who switch to THS [IQOS] are exposed to fewer and lower levels of harmful chemicals and show favorable changes in multiple biomarkers of potential harm associated with smoking-related disease.’ This conclusion was consistent with results observed in former smokers — though researchers noted that long-term health outcome studies are still needed. |
These are meaningful results — but they come from a manufacturer with a commercial interest in the outcome. The scientific community applies this context rigorously, which is why independent verification matters.
3. What the U.S. FDA Actually Ruled — and What It Did NOT Rule
| FDA RULING ON IQOS — WHAT IT MEANS (AND WHAT IT DOESN’T)In July 2020, the U.S. FDA authorised IQOS as a ‘Modified Exposure’ tobacco product. This means: The FDA agreed that available evidence shows IQOS reduces users’ exposure to some harmful chemicals compared to cigarettes. This is the ‘Modified Exposure Order’ (MRTP — exposure tier). This does NOT mean: The FDA agreed that IQOS reduces the risk of tobacco-related disease. The FDA explicitly stated it did not meet the higher standard of ‘Modified Risk’ — meaning PMI cannot legally claim IQOS reduces the chance of cancer, heart disease, or other smoking-related conditions. The FDA repeated this position in March 2022 when reviewing a subsequent PMI application. |
This distinction is not a technicality — it reflects a genuine gap in the evidence. Reducing a user’s exposure to specific harmful chemicals does not automatically translate to a reduction in disease risk. The biological pathways from chemical exposure to disease are complex, and long-term epidemiological studies on IQOS users — the kind needed to confirm real-world disease outcomes — are still in progress.
What the FDA ruling confirms: IQOS exposes users to fewer harmful combustion by-products than cigarettes. What it does not confirm: that switching from cigarettes to IQOS makes you measurably less likely to develop cancer, heart disease, or lung disease over time. That answer requires decades of follow-up data that does not yet exist.
4. What Independent Studies Show — Beyond the Manufacturer’s Data
Independent research on IQOS — studies not funded or conducted by Philip Morris International — broadly confirms the reduction in combustion by-products while raising important caveats:
| FRENCH INCA / IRESP STUDY — 2026Led by the French National Cancer Institute (INCa) and the French Institute for Public Health Research (IResP): • IQOS emitted 96.2% fewer polycyclic aromatic hydrocarbons (PAHs) than tobacco cigarettes — one of the highest confirmed reductions from an independent source. • IQOS produced ~85% fewer carbonyl compounds than cigarettes (35 µg/puff vs 230 µg/puff). • However, researchers noted: ‘several harmful carbonyls were still measured in IQOS aerosol, such as acetaldehyde and formaldehyde, which are carcinogenic compounds. • Vaping was found to produce even fewer of these compounds than IQOS, though with different compound profiles. |
Other independent findings from the broader scientific literature:
- Some harmful compounds in IQOS aerosol are higher than in cigarette smoke — including glycidol, which is found in IQOS aerosol but not in cigarette smoke. This was highlighted by both independent researchers and the FDA itself.
- A scoping review of IQOS toxicity studies (published in Tobacco Induced Diseases journal) found that while PMI studies consistently showed beneficial outcomes, independent and non-industry studies reported either harmful effects or no significant difference compared to control conditions.
- Public Health England’s 2018 evidence review described heat-not-burn products as lower in toxicants than cigarettes — but this assessment predates the current TEREA-era evidence base and is now several years old.
- Long-term health outcome data does not yet exist for IQOS. The product has been commercially available at scale only since 2014. The multi-decade follow-up studies required to confirm whether reduced chemical exposure translates into reduced disease risk are not yet complete.
5. IQOS TEREA vs Cigarettes — Harmful Compound Comparison
The table below summarises what the published evidence shows for key harmful compounds across both products:
| Harmful Compound | Cigarettes | IQOS TEREA | What It Means |
|---|---|---|---|
| Carbon Monoxide (CO) | High levels | ~98% lower | CO causes cardiovascular damage; IQOS dramatically reduces it |
| Polycyclic Aromatic Hydrocarbons | High levels | ~96% lower | PAHs are primary carcinogens from combustion; combustion absent in IQOS |
| Carbonyl Compounds | 230 µg/puff avg | ~85% lower | Acetaldehydes, formaldehyde — still measurably present in IQOS aerosol |
| Nicotine | Present | Comparable levels | Nicotine content is similar — both are addictive |
| Benzene | Present | Significantly lower | Known carcinogen; lower in IQOS but not zero |
| Acrolein | Present | Significantly lower | Respiratory irritant; reduced but measurable in IQOS aerosol |
| Formaldehyde | Present | Lower — but present | Still detected in IQOS aerosol; a recognised carcinogen |
| Nitrogen Oxides | Present | Lower | Respiratory toxicants; reduced in IQOS aerosol |
| Glycidol | Not applicable | Present (IQOS only) | Found in IQOS aerosol but not cigarette smoke — an emerging concern |
| IMPORTANT — HEALTH DISCLAIMER‘Significantly lower’ and ‘% fewer’ refer to the aerosol or smoke produced by each product under standardised testing conditions. Individual exposure varies based on usage pattern, puff frequency, and other factors. Lower levels of a compound does not mean zero risk from that compound. |
6. What IQOS TEREA Is — and What It Is Not
| ✓ IQOS TEREA IS… | ✗ IQOS TEREA IS NOT… |
|---|---|
| ✓ A heated tobacco product (HNB) | ✗ Risk-free or completely safe |
| ✓ Generates aerosol, not smoke | ✗ A quitting aid or cessation tool |
| ✓ Lower in combustion by-products | ✗ Proven to reduce disease risk |
| ✓ FDA-authorised for modified exposure claims | ✗ Approved as ‘modified risk’ by FDA |
| ✓ Real tobacco with real nicotine | ✗ An alternative to quitting entirely |
| ✓ Legal for adults 21+ in UAE | ✗ Recommended for non-smokers |
| ✓ Significantly less smell and no ash | ✗ Guaranteed to improve health outcomes |
| ✓ An option adult smokers may consider | ✗ Equally safe for all tobacco users |
7. What This Means for Adult Smokers in Dubai and the UAE
The UAE is home to a large population of adult smokers — and IQOS TEREA is a legal, widely available, and increasingly popular alternative. For adult smokers already using cigarettes who are considering switching, here is what the evidence honestly supports:
| WHAT THE EVIDENCE SUPPORTS FOR UAE ADULT SMOKERS Supported: IQOS TEREA produces fewer combustion by-products than cigarettes. If you are currently smoking cigarettes and switch fully to IQOS TEREA, your exposure to most harmful combustion chemicals will be significantly lower. Not yet supported by evidence: That switching from cigarettes to IQOS TEREA will reduce your long-term risk of developing cancer, heart disease, or other tobacco-related conditions. This may prove to be true — but the multi-decade outcome studies required to confirm it are not yet complete. Supported: IQOS TEREA is not suitable for non-smokers. The risks of starting nicotine use — addiction, cardiovascular effects, and potential long-term harms — apply equally to IQOS as to any nicotine-containing product. Not supported: Using IQOS TEREA as a tool to quit nicotine entirely. IQOS is not a cessation device. It replaces one nicotine-delivery system with another. If your goal is to stop using nicotine, consult a healthcare professional about evidence-based cessation options. |
IQOS TEREA is legal for adults aged 21 and above across the UAE. Products sold through licensed UAE retailers carry ESMA (Emirates Authority for Standardization and Metrology) certification. For the full UAE legal framework on heated tobacco products, see Is Terea IQOS Legal in Dubai, UAE?.
8. Where Does IQOS TEREA Sit Compared to Vaping?
A question that comes immediately after the cigarette comparison for most UAE buyers:
| IQOS TEREA VS VAPING — HARM COMPARISON SUMMARY Vaping (e-cigarettes): No tobacco — heats liquid (propylene glycol, vegetable glycerine, flavourings, nicotine). Independent studies suggest vaping produces even fewer tobacco-specific harmful compounds than IQOS. The French INCa/IResP study found vaping produced between 64.9–78.2% fewer PAHs than IQOS. However, vaping introduces different compounds — glycerol degradation products — whose long-term effects are also not yet fully understood. IQOS TEREA: Contains real tobacco — which means tobacco-specific nitrosamines and other tobacco compounds are present in the aerosol. Independent data confirms fewer combustion compounds than cigarettes, but more than vaping in most categories. However, the real-tobacco experience is closer to cigarettes in nicotine delivery character, which is why many switchers find IQOS more satisfying as a substitute than a vape. |
The consensus from independent researchers: on most chemical measures, the harm hierarchy runs cigarettes > IQOS TEREA > vaping. But ‘lower on chemical measures’ does not mean ‘proven to be safer over a lifetime’ — that evidence does not yet exist for either IQOS or modern vaping devices. For a full comparison between TEREA and vaping for UAE buyers, see Terea vs Vape in Dubai: What’s the Difference?.
Frequently Asked Questions — IQOS TEREA Health & Safety
Is IQOS TEREA less harmful than cigarettes?
IQOS TEREA produces significantly fewer harmful combustion by-products than cigarettes — approximately 96% fewer polycyclic aromatic hydrocarbons (PAHs) and 98% less carbon monoxide, according to independent studies including the 2026 French National Cancer Institute research. However, IQOS aerosol still contains harmful compounds including formaldehyde and acrolein. Whether reduced chemical exposure translates to reduced disease risk over time remains scientifically unproven.
Is IQOS FDA approved?
IQOS received U.S. FDA authorisation in July 2020 as a ‘Modified Exposure’ tobacco product — meaning the FDA agreed it reduces exposure to some harmful chemicals compared to cigarettes. However, the FDA did NOT authorise it as a ‘Modified Risk’ product, meaning Philip Morris International cannot legally claim IQOS reduces the risk of cancer, heart disease, or other tobacco-related diseases. This distinction reflects genuine uncertainty about long-term health outcomes.
Does IQOS TEREA contain nicotine?
Yes. Every Terea stick contains approximately 0.5mg of nicotine — comparable to the nicotine delivered by a conventional cigarette. IQOS TEREA is not a nicotine-reduction product. It delivers similar nicotine levels to cigarettes while reducing exposure to combustion by-products. Both products are addictive. Nicotine’s effects on cardiovascular health, adolescent brain development, and addiction risk apply equally to IQOS TEREA.
Is IQOS TEREA safe for non-smokers?
No. IQOS TEREA is a tobacco product containing nicotine. It is intended as an alternative for adult smokers — not as a product for non-smokers or people who have never used tobacco. Starting nicotine use carries its own health risks regardless of the delivery method. In the UAE, IQOS products are legal only for adults aged 21 and above. The information in this guide is directed at current adult smokers only.
Can I use IQOS TEREA to quit smoking?
No. IQOS TEREA is not a smoking cessation product. It replaces one nicotine-delivery method with another — it does not reduce nicotine dependence. If your goal is to stop using nicotine entirely, consult a healthcare professional about evidence-based cessation options. IQOS is intended for adult smokers who would otherwise continue smoking — not as a pathway to becoming nicotine-free.
Does IQOS TEREA smell like cigarettes?
No. IQOS TEREA produces no combustion smoke — only a tobacco aerosol that dissipates within seconds and leaves minimal lasting odour on clothing, furniture, or enclosed spaces. The aerosol has a mild, warm tobacco scent that most users describe as noticeably less intrusive than cigarette smoke. This is one of the most frequently cited practical advantages of switching from cigarettes to IQOS in the UAE.
How is IQOS different from vaping?
IQOS TEREA uses real tobacco — heated to 350°C to produce an aerosol without combustion. Vaping uses no tobacco — it heats e-liquid (propylene glycol, vegetable glycerine, flavourings, nicotine) to produce vapour. Both are different from cigarettes. Most independent studies suggest vaping produces fewer harmful compounds than IQOS on most chemical measures, but IQOS delivers a real-tobacco experience that many cigarette smokers find more satisfying as a direct substitute. See Terea vs Vape in Dubai for the full comparison.
What harmful chemicals does IQOS TEREA still contain?
IQOS TEREA aerosol still contains measurable levels of formaldehyde, acetaldehyde, acrolein, benzene, and nicotine — though at significantly lower levels than cigarette smoke for most compounds. Importantly, IQOS aerosol also contains glycidol — a compound found in heated glycerol — which is not present in cigarette smoke. Independent researchers have flagged glycidol as an emerging area of concern requiring further study.
Is IQOS TEREA legal in Dubai?
Yes. IQOS TEREA is legal for adults aged 21 and above across Dubai and the UAE. Heated tobacco products are regulated as tobacco products by the UAE government and sold through licensed retailers. For the full details on UAE regulations, age verification, and ESMA certification requirements, see Is Terea IQOS Legal in Dubai, UAE?.