Chloe Adams
Burning candles is a popular pastime, but there are concerns about the potential health risks of the smoke and chemicals they release. While anything with an open flame poses a fire risk, the question remains whether candles can cause respiratory issues or lung problems. Some studies have found that candle emissions can cause a decrease in lung function, while others have found no association between candle use and lung function or asthma and COPD. The science is split on whether the emissions generated by candles can significantly impact health, with some experts noting that the effects, if any, are minimal, especially in well-ventilated spaces.
Do candles cause lung problems?
| Characteristics | Values |
|---|---|
| Candles emit hydrocarbons, toluene, benzene, and other chemicals | Toluene exposure without proper ventilation can irritate the eyes, nose, throat, and skin, and cause headaches, dizziness, confusion, and anxiety |
| Candles contribute to air pollution | Air pollution can cause respiratory issues, especially in people with pre-existing lung issues such as asthma or COPD |
| Scented candles can release VOCs like formaldehyde, which may increase cancer risk | However, the amount of formaldehyde released is less than half of the recommended amount set by the World Health Organization, and it is unclear if this affects health |
| Burning candles can release UFP, which may be associated with reduced lung function | A cross-sectional study of 78 healthy middle-aged Danes found an association between high levels of UFP from candle use and reduced lung function, but another study of 3471 participants found no association between candle use and lung function |
| Candle emissions may be associated with pulmonary inflammation, impaired endothelial function, and increased arterial stiffness | Animal studies have shown these effects, but human studies on long-term candle use are scarce |
| Candle usage is prevalent among female university students in Saudi Arabia, and has been associated with health problems such as wheezing, headaches, shortness of breath, and coughing | However, the study population was small and may not be representative |
| People with bladder cancer or chronic lung conditions may want to minimize candle usage due to the potential risk of air pollution | The science is not strong enough to suggest that candle usage needs to be stopped |
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What You'll Learn
Candle emissions and lung inflammation
Burning candles is a common practice in many households, often associated with relaxation and ambiance creation. However, concerns have been raised about the potential impact of candle emissions on lung health and inflammation. While the science is still evolving, there are some key insights worth noting.
Firstly, it is important to understand that burning candles does release chemicals and pollutants into the air. These emissions include hydrocarbons such as toluene and benzene, which are also found in paint thinners, adhesives, and industrial processes. While the concentrations of these chemicals from candles are typically low, they can accumulate in enclosed, poorly ventilated spaces. This accumulation may lead to eye, nose, throat, and skin irritation, as well as headaches, dizziness, and even anxiety.
Multiple studies have investigated the potential link between candle emissions and respiratory health. Some animal studies have suggested that exposure to candle emissions can lead to pulmonary inflammation and impaired lung function. However, human studies have produced mixed results. One cross-sectional study of middle-aged Danes found an association between high levels of ultrafine particles (UFPs) from candle use and reduced lung function. In contrast, another cross-sectional study with a larger sample size did not find a link between candle use and lung function or respiratory symptoms.
It is worth noting that the type of candle may also play a role. Scented candles, for example, have been associated with respiratory symptoms such as wheezing, shortness of breath, and coughing, particularly among young university students in Saudi Arabia. Additionally, a small number of studies suggest a potential link between candle burning and bladder cancer, with volatile organic hydrocarbons accumulating in the blood and excreted through the bladder. However, the scientific evidence is not strong enough to warrant discontinuing candle use altogether.
Overall, while candle emissions may contribute to air pollution and have been linked to lung inflammation in animal studies, the direct impact on human lung health is less clear. The available human studies suggest that the effects, if any, are likely minimal, especially when candles are burned in well-ventilated spaces. As with any potential source of indoor air pollution, it is advisable to exercise moderation and ensure adequate ventilation when burning candles to minimize any potential risks to lung health.
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Candle burning and bladder cancer
While the act of burning candles has been associated with a range of health effects, the specific topic of candle burning and bladder cancer has emerged as a particular area of interest. Scented candles, with their potential to release volatile organic compounds (VOCs) like formaldehyde, have been suggested to increase the risk of bladder cancer. This is especially pertinent given the popularity and widespread availability of scented candles, coupled with limited quality regulations and unclear raw materials.
The exact causes of bladder cancer remain elusive, but research has identified several risk factors. Notably, chronic exposure to aromatic hydrocarbons, as well as exposure to aromatic amines, diesel exhaust fumes, and chronic inflammation within the urinary bladder, have been established as risk factors. The identification of these correlations has led to enhanced safety measures in the chemical industry, resulting in a decrease in bladder cancer cases among workers.
The potential link between scented candle use and bladder cancer development is a subject of ongoing investigation. While the exact correlation remains uncertain, it is known that burning scented candles can release a variety of substances associated with bladder cancer. This includes the release of hydrocarbons, which, according to some sources, does not pose a significant health risk in most cases. However, it is recommended to choose candles wisely and burn them responsibly, especially in well-ventilated areas.
The dyes used in some candles have also been flagged as a potential concern, as they may contain benzidine, a known carcinogen linked to an increased risk of bladder cancer. Nevertheless, it is important to note that the science around the dangers of scented candles is not yet conclusive, and the risks associated with candle burning are generally considered less significant than other everyday activities such as indoor cooking.
In summary, while the link between candle burning and bladder cancer is not yet fully established, it has raised awareness about the potential presence of unrecognized carcinogenic chemicals in household items. This highlights the importance of further research and the need for consumers to make informed choices when using scented candles, particularly for individuals with existing health concerns such as bladder cancer or chronic lung conditions.
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Asthma and scented candles
Burning candles, including scented candles, release chemicals and particulate matter. While a 2014 study found that the amount of particulate matter released by candles is not enough to cause health problems in humans, other studies have found that candle emissions can lead to a decrease in lung function and an increase in respiratory and non-respiratory symptoms such as coughing, shortness of breath, headaches, and even asthma attacks.
One study found that the prevalence of adverse symptoms among university students in Saudi Arabia who used scented candles was 24.8%, which was higher than the results reported in the general population of the United States (22.3%), Australia (20.3%), the United Kingdom (13.9%), and Sweden (17.9%). The study suggested that the emission of VOCs, phthalates, and PM from scented candles may be responsible for these adverse symptoms.
Another study reported that individuals with asthma and chemical sensitivity showed adverse effects to scented products, including scented candles, in higher proportions than the general public. The synthetic fragrances used in scented candles often contain phthalates, which can be released into the air when the candle is burned. These phthalates can then be inhaled or absorbed through the skin and can exacerbate allergic symptoms and asthma, as well as alter hormone levels.
However, it is important to note that the association between candle use and asthma may be inverse, as people with asthma may experience overt symptoms when exposed to candle emissions and therefore refrain from using candles. Additionally, a Danish cross-sectional study found no association between self-reported candle use and lung function or asthma diagnosis.
To minimize any potential risks associated with scented candles, it is recommended to use them in well-ventilated spaces and to follow safety guidelines provided by organizations such as the European Candle Association.
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Candle smoke and indoor air pollution
Burning candles release chemicals and hydrocarbons, including toluene and benzene, into the air. While anything with an open flame poses a fire risk, the health effects of candle emissions are disputed.
The Arguments for Candle Pollution
Experimental animal studies have shown that exposure to candle emissions leads to pulmonary inflammation, impaired endothelial function, and a decrease in lung and cognitive function. A 2023 study of Saudi university students also found a significant association between scented candle usage and wheezing. A small number of studies also suggest a link between candle burning and bladder cancer.
The Counterarguments
However, human exposure studies have found that candle emissions only cause a transient decrease in lung function. Other studies have found no association between candle use and lung function or the diagnosis of asthma or chronic obstructive pulmonary disease (COPD). A 2014 study also found that the amount of particulate matter released from burning candles is not enough to cause health problems in humans.
Best Practices for Burning Candles
While the science is not strong enough to suggest we should stop burning candles, it's still important to burn candles responsibly. The European Candle Association advises against burning candles in drafty areas. Unless you are under surveillance for, living with, or in remission from bladder cancer, or you have a chronic lung condition, you can continue to burn candles as long as you take the proper fire-safety precautions.
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Fire risks and smoke inhalation
Candles are a potential fire hazard and can cause smoke inhalation issues if not used properly. While they can bring warmth and lift your mood, it's important to be aware of the risks associated with their use.
Fire Risks
Firstly, a lighted candle is an open flame, and if left unattended or not carefully monitored, it can pose a serious fire risk. According to the National Fire Protection Association, half of all candle fires start when a flammable piece of décor, such as furniture, mattresses, bedding, curtains, or clothing, is placed too close to the lit candle. It is recommended to keep burning candles at least three inches away from one another and at least three inches away from any flammable objects. Additionally, candles should never be left unattended, and it is advised to discontinue burning a candle when only half an inch of wax remains to prevent accidents.
Smoke Inhalation
Regarding smoke inhalation, while some experts claim that paraffin-wax candles, when used as directed, are not harmful when inhaled, there is some conflicting evidence. Experimental animal studies have shown that exposure to candle emissions can lead to pulmonary inflammation and impaired endothelial function. Additionally, a study from 2001 noted that scented candles produce more soot than unscented ones, which can be harmful to inhale. To minimise soot, it is recommended to trim wicks regularly and avoid burning candles for extended periods.
It is worth noting that the potential risks associated with candle use may be mitigated by following proper safety guidelines, such as those provided by the National Candle Association. These guidelines include using a heat-resistant candle holder, avoiding drafts, and ensuring that hair and loose clothing are kept away from the flame.
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Frequently asked questions
Burning candles release hydrocarbons, chemicals, and particulate matter into the air, which can irritate the lungs and cause respiratory issues. However, the concentration of these emissions is usually not high enough to cause serious health problems, especially in well-ventilated spaces.
While there is no direct scientific evidence that candle emissions cause lung problems in people with asthma, asthma-like symptoms have been observed in scented candle users, which may lead to adult-onset asthma later in life.
Soy candles produce less soot and toxic chemicals than paraffin candles. Flameless candles and wax melts are other alternatives that do not pose a fire risk or release combustion byproducts.
