Scented Candles Could Be Harming Your Health

There's something undeniably comforting about lighting a scented candle at the end of a long day. Whether you're trying to set a cozy mood or fill your space with seasonal aromas, candles are a staple in many homes. But before you strike that next match, it’s worth taking a closer look at how scented candles can impact your health.

While they’re often associated with relaxation, certain ingredients and byproducts of scented candles may do more harm than good especially for sensitive individuals. Here are five science-backed reasons to think twice about burning them regularly.

1. They Can Release Respiratory Irritants

When you light a scented candle, you're not just releasing fragrance you’re also introducing airborne compounds that can irritate the respiratory system.

Common symptoms may include:

• Coughing or throat irritation

• Shortness of breath

• Runny nose or nasal congestion

• Headaches

• Skin rashes

Even people without known sensitivities can experience these effects, especially in enclosed or poorly ventilated spaces.

A study published in the Journal of Environmental Health found that burning scented candles releases particles small enough to penetrate deep into the lungs, potentially impacting respiratory health in the long term.

2. They May Trigger Allergic Reactions

Some candles contain artificial fragrances or essential oils that can trigger allergic rhinitis or other immune responses even if the candle isn’t burning.

Typical allergy symptoms include:

• Sneezing

• Watery eyes

• Nasal congestion

• Itchy skin or throat

Those with fragrance allergies may react to both synthetic and natural scent compounds. Even passive exposure such as walking into a room where a candle has recently burned can be enough to cause discomfort.

3. They Can Aggravate Asthma

For people with asthma, burning scented candles can be particularly problematic. Fragrances and airborne chemicals released during combustion may provoke an asthma attack or worsen existing symptoms.

A study by the American College of Allergy, Asthma & Immunology found that exposure to scented products including candles was a top trigger for asthma flare-ups, especially in children and those with severe or uncontrolled asthma.

Important tip: If you’re considering giving candles as gifts, make sure the recipient doesn’t have asthma or fragrance sensitivity.

4. They Contribute to Indoor Air Pollution

Burning candles especially those made from paraffin wax can release volatile organic compounds (VOCs) such as:

• Acetone

• Benzene

• Toluene

These substances are also found in paint and household cleaners, and long-term exposure has been linked to increased risks of respiratory illness and even certain types of cancer.

Additionally:

• Many scented candles contain phthalates, which are known endocrine disruptors.

• The soot produced by burning candles is elemental carbon, which contributes to indoor air pollution.

Reduce the impact by:

• Trimming the wick to 1/4 inch before lighting

• Burning candles in well-ventilated areas

• Limiting the total burn time to 1–2 hours

5. They Pose a Fire Risk

Beyond health concerns, candles remain a leading cause of home fires in the U.S. According to the National Fire Protection Association:

• Candles cause about 4% of all home fires

• December is the peak month for candle-related incidents

• One-third of candle fires start in bedrooms

To burn candles more safely:

• Keep at least 12 inches between a candle and anything that can burn

• Never leave a candle unattended

• Use a phone reminder to extinguish candles before leaving the room

• Store candles and matches out of reach of children and pets

So, Should You Skip Scented Candles?

Not necessarily. If you don’t have asthma, allergies, or fragrance sensitivities, an occasional scented candle in a well-ventilated room is likely safe. But it’s worth being selective look for:

• Candles made from soy, beeswax, or coconut wax

• Fragrance-free or naturally scented varieties

• Lead-free wicks and phthalate-free labeling

And if you're gifting candles, be mindful of your recipient's sensitivities and living environment.

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