Katrina Rosales
Incense is a popular practice worldwide, with burning incense being an integral part of daily life in large parts of Asia. However, concerns have been raised about the potential health risks associated with incense smoke, including respiratory problems and cancer. The smoke produced by burning incense contains particulate matter, including carcinogens and irritants, which can increase the risk of respiratory tract carcinomas and other health issues. While some studies have found a link between incense smoke and cancer, particularly with long-term use, others have suggested that the association is not convincing, and further research is needed to fully understand the impact of incense smoke on human health.
| Characteristics | Values |
|---|---|
| Incense smoke contains carcinogens | Yes, incense smoke contains carcinogens and irritants that could lead to respiratory diseases such as asthma. |
| Incense smoke causes cancer | While incense smoke contains carcinogens, no convincing association has been reported between incense smoke exposure and cancer development. However, some studies suggest that long-term incense use is associated with an increased risk of squamous cell carcinoma of the respiratory tract. |
| Incense smoke and respiratory diseases | Incense smoke contains various irritants and has been associated with an increased risk of respiratory allergies and asthma. It can also trigger chronic inflammation in the body. |
| Incense smoke and other health risks | In addition to respiratory risks, incense smoke has been linked to an increased risk of heart disease and potential issues with brain health in older adults. |
| Incense smoke and indoor air quality | Burning incense indoors increases the levels of polycyclic aromatic hydrocarbons (PAHs), which have been linked to cancer. It is also a major source of residential indoor particulate matter, which can aggravate respiratory and cardiovascular diseases and potentially contribute to cancer. |
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What You'll Learn
- Incense smoke contains carcinogens and irritants
- Burning incense increases levels of polycyclic aromatic hydrocarbons (PAHs)
- Long-term incense use increases the risk of squamous cell carcinoma
- Incense smoke can trigger asthma and chronic inflammation
- Burning incense may cause issues with brain health in older adults
Incense smoke contains carcinogens and irritants
The particulate matter in incense smoke is made up of particles less than 2.5 micrometres in diameter, which can go as deep as the alveoli in the lungs. These fine particles are believed to pose the largest health risks. The combustion of incense is a major source of indoor particulate matter, especially in the 2.5 μm size range and below. Exposure to this particulate matter can aggravate chronic respiratory and cardiovascular diseases, alter host defences, damage lung tissue, and possibly contribute to cancer.
In addition to particulate matter, incense smoke contains other harmful compounds such as aldehydes, which are known for their irritating properties. Exposures to formaldehyde, for example, can be particularly concerning as it is a potent sensory irritant and a probable human carcinogen. Polycyclic aromatic hydrocarbons (PAHs) are another group of compounds found in incense smoke, and these have been linked to an increased risk of peripheral arterial diseases.
The burning of incense has also been associated with an increased risk of upper respiratory tract carcinomas and lung carcinomas. A study in Singapore found that long-term use of incense was associated with a significantly increased risk of squamous cell carcinomas in the entire respiratory tract. However, no overall effect was observed on lung cancer.
It is important to note that the research on the potential harms of incense smoke has some limitations. For example, a study that claimed incense smoke was equal to smoking in terms of cancer risk mentioned the burning of hundreds to thousands of sticks at once, which is not representative of typical incense use.
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Burning incense increases levels of polycyclic aromatic hydrocarbons (PAHs)
Burning incense is a popular practice worldwide, but its effects on human health have been questioned. Studies have found that burning incense increases levels of polycyclic aromatic hydrocarbons (PAHs), which have been linked to cancer.
PAHs are hazardous substances produced by the incomplete combustion of organic materials, including incense. The combustion efficiency of smoldering incense is approximately 60–70%, and it generates a high amount of gaseous and particulate pollutants. These pollutants include harmful gases such as methane, methanol, ethylene, ammonia, and formaldehyde, as well as hazardous volatile organic compounds (VOCs) and semi-VOCs (SVOCs). The aerodynamic diameter of the particles emitted from burning incense is typically less than 1 μm, allowing them to penetrate deep into the lungs and deposit in the respiratory system.
The presence of PAHs alone does not indicate risk; it depends on the amount. However, studies have shown that incense smoke contains carcinogens and irritants, which could lead to respiratory diseases and increase the risk of certain cancers, particularly upper respiratory tract carcinomas and squamous cell carcinomas. The relative risk of squamous cell carcinomas among long-term incense users was found to be 1.8 in a cohort of Singapore Chinese individuals.
In addition to the potential cancer risks, burning incense may also trigger asthma and other respiratory allergies due to the irritants present in the smoke. Research has also associated incense smoke with childhood asthma and the development of respiratory allergies. Furthermore, studies suggest that incense smoke can cause chronic inflammation in the body and potentially impact brain health in older adults, leading to issues with cognitive performance and decreased brain connectivity.
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Long-term incense use increases the risk of squamous cell carcinoma
Incense burning is a common practice in many parts of the world, especially in Asia, where it is an integral part of daily life and religious ceremonies. However, concerns have been raised about the potential health risks associated with incense smoke exposure, particularly the development of cancer.
While the link between incense and cancer is not yet fully understood, several studies have indicated that long-term incense use is associated with an increased risk of squamous cell carcinoma in the respiratory tract. This risk appears to be influenced by the duration and intensity of incense burning. A study found that long-term incense users had a relative risk of 1.8 for developing squamous cell carcinomas in the entire respiratory tract.
The smoke emitted from burning incense contains a variety of natural and unnatural ingredients, creating small inhalable particulate matter. This particulate matter includes carcinogens and irritants, which are known to have detrimental effects on respiratory health. The particulate matter can aggravate chronic respiratory conditions, alter host defenses, damage lung tissue, and potentially contribute to cancer development.
Additionally, incense smoke has been found to increase levels of polycyclic aromatic hydrocarbons (PAHs) indoors. PAHs are produced by burning organic materials, and while their mere presence does not indicate risk, higher concentrations have been linked to an increased cancer risk. The emission from burning incense also contains toxic substances such as lead, iron, and manganese, which can have harmful effects on the body.
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Incense smoke can trigger asthma and chronic inflammation
While the link between incense and cancer is still being debated, the smoke emitted by incense sticks has been linked to asthma and chronic inflammation. Incense smoke contains various irritants and toxic compounds, including particulate matter, that can trigger asthma and cause respiratory issues.
Particulate matter refers to small particles that are released into the air during the combustion of incense. These fine particles can be inhaled and can reach the deepest parts of the lungs, including the alveoli. The presence of particulate matter in incense smoke has been confirmed by multiple studies, and it is known to contain carcinogens and irritants that can lead to respiratory problems.
The smoke from burning incense has been associated with an increased risk of developing asthma and respiratory allergies. This is especially true for children, as research has linked incense smoke exposure to the development of childhood asthma and respiratory allergies.
In addition to the respiratory risks, incense smoke has also been implicated in triggering chronic inflammation in the body. This inflammation is caused by the body's processing of particulate matter into metabolites, which also leads to oxidative stress. While further research is needed to fully understand the mechanisms involved, the potential impact on brain health in older adults has been suggested by some studies.
The effects of incense smoke on asthma and chronic inflammation are concerning, and it is important to consider the potential risks associated with its use. While burning incense may have cultural and religious significance, it is crucial to ensure that it is used in well-ventilated areas to minimise the potential harm to respiratory health.
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Burning incense may cause issues with brain health in older adults
Burning incense is a popular practice across the globe, with joss sticks being the most common type used at home. Incense burning is an integral part of daily life in large parts of Asia, and in addition to its use in places of worship, approximately half of the populations across South-East Asia burn incense at home daily.
The burning of incense releases a variety of pollutants, including particulate matter (PM), carbon monoxide (CO), carbon dioxide (CO2), sulfur dioxide (SO2), nitrogen dioxide (NO2), volatile organic compounds, aldehydes, and polycyclic aromatic hydrocarbons (PAHs). These pollutants contribute to indoor air pollution, with the amount of PM generated by incense burning being up to 4.5 times higher than that of cigarettes.
While some studies have found an association between incense use and an increased risk of certain types of cancer, particularly upper respiratory tract carcinomas, others have concluded that there is no convincing link between incense smoke exposure and cancer development.
However, a 2020 study found that burning incense may negatively impact brain health in older adults over 65 years of age. This study suggested that incense burning induces functional changes in the brain, leading to reduced cognitive resilience and increased vulnerability to future cognitive decline. The precise mechanisms behind these associations are yet to be fully understood and require further investigation.
The study also highlighted the potential interaction between incense burning and vascular diseases, which could further contribute to poor cognitive functioning. Given the high prevalence of vascular burden among older adults, the practice of indoor incense burning within this population should be approached with caution.
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Frequently asked questions
Burning incense is a powerful producer of particulate matter, and the smoke contains carcinogens. However, no convincing association has been reported between exposure to incense smoke and cancer development.
Burning incense may trigger asthma and other respiratory allergies. It can also cause chronic inflammation in the body and affect heart tissues.
Incense contains natural and unnatural ingredients that create small, inhalable particulate matter. These include volatile organic compounds (VOCs) like aldehydes, which are known to be irritating to the eyes and respiratory tract.
If you are concerned about the risks of burning incense, you can explore alternatives such as essential oils, scented candles, or diffusers.
