Scented candles and health: how to enjoy them safely

In Switzerland as elsewhere, scented candles hold a special place in our homes. They create a warm atmosphere and invite relaxation. Yet behind this soft light and enveloping fragrances lies a legitimate question: what is the real impact of scented candles on health? ADEME, in its EBENE study, identified these products as sometimes significant sources of gaseous and particulate pollutants in indoor air. It is therefore essential to distinguish quality candles from potentially harmful products. In fact, we explore in detail the benefits of scented candles on well-being in a dedicated guide.

This comprehensive insight will help you understand what science really says, identify components to avoid, and make informed choices. Because olfactory pleasure should never come at the expense of your respiratory well-being, there are concrete solutions to combine peace of mind and caution. The topic of scented candles and health deserves a nuanced approach, far from alarmist shortcuts.

What candle combustion actually releases into the air

Any flame, whether from a fireplace or a simple candle, produces residues during combustion. This physical phenomenon is inevitable. The question is not whether a candle emits substances, but which ones and in what quantity.

When a scented candle burns, it mainly releases carbon dioxide (CO₂), carbon monoxide (CO), volatile organic compounds (VOCs), and fine particles. Among the most concerning VOCs are benzene, formaldehyde, and toluene, substances known to be irritants or potentially carcinogenic with high exposure. A survey by the magazine 60 million consumers, published in September 2025, confirmed that air fresheners, including candles, emit pollutants that can harm health.

However, it is crucial to nuance. The reference study by ADEME (EBENE study) dates from 2017. Emission levels strongly depend on the candle’s composition: type of wax, nature of the fragrance, wick material. An industrial paraffin candle with synthetic fragrance does not emit the same substances as a handmade vegetable wax candle with quality fragrances.

Paraffin, vegetable wax, and wick: the components that make the difference

Not all candles are equal. Composition is the primary factor determining your respiratory health. Here are the key elements to examine before any purchase.

Wax: fundamental for clean burning

Paraffin, derived from petroleum, remains the most used wax in the industry. It is cheap and easy to work with. However, its combustion can release polycyclic aromatic hydrocarbons (PAHs), classified as probable carcinogens by the International Agency for Research on Cancer.

Vegetable waxes (soy, coconut, rapeseed) are a healthier alternative. Their combustion is generally slower and cleaner, with significantly reduced VOC levels. To learn more about this topic, check out our article explaining why choosing a vegetable wax candle is a concrete step for your well-being.

The wick: a detail that matters

Metal-core wicks (lead, zinc) can release traces of heavy metals during combustion. In the United States, lead wicks were banned as early as 2003. Natural cotton or linen, without metal cores, are the safest options. They ensure regular burning without emitting metal particles.

Fragrance: natural does not always mean harmless

Cheap synthetic perfumes often contain phthalates, synthetic musks, and benzene derivatives. These substances are recognized as endocrine disruptors or allergens. But beware: burned essential oils are not without criticism either. According to an article in the magazine Que Choisir (2008), their combustion can also release formaldehyde and benzene, even at low concentrations.

The key lies in the quality of the fragrances used and their dosage. Grasse perfumes, for example, are crafted according to centuries-old expertise that allows control over olfactory compositions. The important thing is to favor manufacturers who are transparent about their ingredients.

Concrete health risks: between alarmism and reality

Should you throw all your candles in the trash? The answer is clearly no. Risks exist, but they largely depend on the frequency of use, product quality, and room ventilation.

The National Agency for Food, Environmental and Occupational Health Safety (Anses) and ADEME have been warning for several years about these little-known dangers. In 2024, the American College of Allergy, Asthma and Immunology (ACAAI) also alerted about the risks associated with indoor combustion products. The most common adverse effects include:

• Irritation of the respiratory tract (coughing, sneezing, runny nose)
• Headaches and dry eyes
• Worsening of asthma in sensitive individuals
• Skin or respiratory allergic reactions

The 60 million consumers survey, published in 2025, analyzed twenty different products across five categories and revealed the presence of potentially dangerous volatile organic compounds in several of them. However, these results mainly concern industrial products, often based on paraffin and synthetic fragrances. Handmade candles made of vegetable wax, with cotton wicks and carefully selected fragrances, have a much more favorable emission profile.

To clearly distinguish risky products, we invite you to consult our dedicated analysis on toxic scented candles.

The most vulnerable people to candle emissions

Certain categories of people need to be extra cautious. Pregnant women, infants, the elderly, and individuals suffering from asthma or respiratory allergies are particularly exposed to the effects of indoor pollutants.

For these sensitive groups, it is not about giving up the pleasure of candles, but adopting enhanced precautions: brief use, systematic ventilation, and exclusive choice of clean-burning products. In a household with young children, for example, favor candles without dye, made of 100% vegetable wax, with a natural cotton wick.

Seven practical steps to enjoy your candles with peace of mind

The good news is that a few simple precautions are enough to significantly reduce the risks. Here are the recommendations that are widely agreed upon by health authorities and indoor air quality experts.

1. Ventilate the room for at least ten minutes after each use. ADEME particularly emphasizes this essential point.
2. Limit the burning time to a maximum of two or three consecutive hours.
3. Trim the wick to about five millimeters before each lighting to reduce soot production.
4. Avoid multiplying combustion sources (candle and incense at the same time, for example) in a confined space.
5. Choose a vegetable wax and a metal-free wick to limit harmful emissions.
6. Keep the candle away from drafts that cause uneven burning and more smoke.
7. Always extinguish the candle when leaving the room or before going to bed.

To go further with best practices, find our tips for safely using your scented candle.

How to recognize a healthy candle: essential selection criteria

With the increasing number of options, it is not always easy to find your way. Here is a comparison table of the main types of candles and their impact on indoor air quality.

Certifications and ingredient traceability are the best indicators of quality. A manufacturer who clearly displays the origin of their wax, the nature of their wick, and the source of their fragrances demonstrates a genuine commitment to consumer health.

Soy and coconut wax: the winning duo for a healthier candle

Among the available vegetable waxes, the soy and coconut blend stands out for its particularly advantageous properties. Soy wax offers a slow and steady burn, while coconut wax improves fragrance diffusion and the candle's texture.

This duo allows for a candle that burns longer, produces less soot, and releases fragrances gradually and evenly. A study published in 2025 in Frontiers in Public Health specifically evaluated the volatile organic compounds emitted by scented candles, confirming that the type of wax directly influences the toxicological profile of emissions. To learn more about this virtuous combination, discover our guide dedicated to soy and coconut wax for a healthier candle.

The pleasure of candles without compromising well-being

Giving up scented candles is not the answer. Research highlights that common perceptions and practices aimed at improving air quality can sometimes pose health risks. The challenge is to make informed choices. In Switzerland, growing awareness of indoor air quality is leading more and more consumers to turn to artisanal products with transparent and controlled compositions.

Scented candles and health are not incompatible. You just need to favor vegetable waxes, natural wicks, and quality fragrances while adopting good usage habits. The evening ritual around a candle can remain a moment of pure relaxation, provided you invest in a product that respects both your well-being and your indoor environment.

This is precisely the philosophy we uphold: clean combustion thanks to 100% vegetable wax, natural cotton wicks, and carefully crafted Grasse fragrances, all handmade in our workshop in French-speaking Switzerland. Discover now our artisanal candles with semi-precious stones and treat yourself to a ritual as healthy as it is refined.

Frequently asked questions

Are scented candles dangerous to health on a daily basis?

Moderate and occasional use does not pose a major risk for a healthy person. The danger mainly comes from intensive use of paraffin-based candles and synthetic fragrances in poorly ventilated spaces. By choosing a vegetable wax candle with a cotton wick, like those offered by Cap-Nature, you minimize harmful emissions.

What is the difference between a paraffin candle and a vegetable wax candle?

Paraffin is a petroleum derivative whose combustion emits more VOCs (benzene, toluene) and fine particles. Vegetable wax (soy, coconut, rapeseed) burns more slowly, produces less soot, and releases significantly fewer problematic substances.

Should you air the room after using a scented candle?

Yes, systematically. ADEME recommends airing the room for at least ten minutes after extinguishing the candle. This simple action helps renew the air and remove any combustion residues.