
Incense is any of several aromatic substances that are burned to emit a fragrant odour, often for religious or spiritual purposes. While incense has been used for thousands of years, recent studies have suggested that it may have negative health impacts, including respiratory issues, cardiovascular disease, and even cancer. Given these potential health risks, does the burning of incense make people angry?
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What You'll Learn
- Incense smoke contains carcinogens and respiratory irritants
- Incense smoke is linked to an increased risk of heart disease
- Burning incense may cause issues with brain health in older adults
- Incense smoke is an indoor and outdoor air pollutant
- Incense smoke is comparable to or more harmful than passive smoking

Incense smoke contains carcinogens and respiratory irritants
Burning incense is a common practice in many parts of the world, especially in the East, and is used for various purposes, including religious ceremonies, meditation, aromatherapy, and deodorising. However, despite its popularity, incense smoke contains particulate matter, including carcinogens and respiratory irritants, which can be easily inhaled and may lead to adverse health effects.
The particulate matter in incense smoke includes fine particles less than 2.5 μm in diameter, which can penetrate deep into the alveoli of the lungs and accumulate in the respiratory system. These particles contain various irritants and carcinogens, which can cause respiratory issues such as asthma and chronic inflammation in the body. Studies have also found associations between incense use and an increased risk of heart disease and cancer.
In addition to particulate matter, incense smoke contains volatile organic compounds such as benzene, toluene, and xylenes, as well as aldehydes and polycyclic aromatic hydrocarbons (PAHs). These compounds contribute to air pollution and have been linked to respiratory system dysfunction and allergic contact dermatitis. The burning of incense also produces gas products, including CO, CO2, NO2, and SO2, which can be inhaled and potentially cause health issues.
While the precise mechanisms of the health effects of incense burning require further research, especially in humans, the growing body of evidence suggests that the practice may pose a significant public health threat. Therefore, it is advisable to reduce exposure time in places with heavy incense smoke and to ventilate areas when burning incense to minimise potential health risks.
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Incense smoke is linked to an increased risk of heart disease
Incense is a smoke-emitting substance that has been burned for thousands of years for its fragrant odour, especially in religious ceremonies. The smoke released has a sweet, pleasant smell and is used for spiritual purposes, meditation, aromatherapy, and to enhance a mood. However, the smoke released from burning incense contains particulate matter, which can be easily inhaled and may have negative health outcomes.
A growing body of evidence has reported the negative effects of incense use on human health, posing a potential threat to public health. The particulate matter in incense smoke contains carcinogens and irritants, which are known to cause respiratory issues such as asthma and allergies. Studies have also found that incense smoke can trigger chronic inflammation in the body, which may affect heart tissues and contribute to overall inflammation.
In particular, a 2020 study found that burning incense may cause issues with brain health in community older adults over the age of 65. This may be due to long-term air pollution caused by burning incense, resulting in smaller brain and prefrontal cortex volumes. Furthermore, incense smoke has been associated with an increased risk of heart disease. While the precise mechanisms behind this link are not yet fully understood, it is believed that the various irritants and toxic compounds in incense smoke, such as benzene, toluene, and xylenes, play a significant role.
It is important to note that the health effects of incense burning are complex and may vary depending on the specific type of incense and the ingredients it contains. While some studies have suggested potential health benefits of incense, such as its use in aromatherapy, the balance of evidence currently indicates that the potential health risks associated with incense smoke, including the risk of heart disease, outweigh any potential benefits. Therefore, it is advisable to reduce exposure to incense smoke and to ventilate indoor areas when incense is burned.
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Burning incense may cause issues with brain health in older adults
Burning incense is a religious ritual practised in many cultures and is especially popular among older adults. Incense is made from a mixture of fragrance materials, herbs, wood, and adhesive powder. When incense is burnt, it releases 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). Incense burning is considered a significant source of indoor air pollution, with the amount of PM generated by incense being up to 4.5 times higher than that of cigarettes.
Several studies have found that burning incense may negatively impact cognitive functions and brain functional connectivity in older adults. While the precise mechanisms underlying these associations are not yet fully understood, the studies suggest that incense burning may induce functional changes in the brain that reduce cognitive resilience and increase vulnerability to future cognitive decline.
For example, a 2020 study found links between incense burning and issues with brain health in community-dwelling older adults over 65 years of age. This study suggested that incense burning could be a risk factor for vascular cognitive impairment (VCI), especially in those with existing vascular diseases.
Additionally, incense smoke has been associated with respiratory conditions, carcinogenicity, and increased cardiovascular mortality. A study in Hong Kong also showed that indoor incense burning was associated with poorer cognitive performance and reduced brain connectivity in older adults within Chinese and other Asian societies.
Given the potential health risks associated with incense burning, it is recommended that older adults, especially those with vascular diseases, exercise caution when practising indoor incense burning. Safer alternatives to traditional incense or avoiding burning incense indoors altogether may be advisable to mitigate potential negative health impacts.
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Incense smoke is an indoor and outdoor air pollutant
Incense burning is a popular activity worldwide, with a significant number of people in Taiwan burning incense daily for religious purposes. However, incense smoke is an indoor and outdoor air pollutant, and its emissions have harmful effects on human health.
The smoke released from burning incense contains particulate matter, gas products, and organic compounds. These particles are inhalable and can accumulate in the respiratory system, leading to potential health risks. The particulate matter in incense smoke includes volatile organic compounds such as benzene, toluene, and xylenes, as well as aldehydes and polycyclic aromatic hydrocarbons (PAHs). These compounds are absorbed onto the particulate matter, making it difficult to isolate the specific health effects of each component in the fumes.
The health effects of incense smoke are comparable to or even more harmful than passive smoking. Studies have associated incense smoke exposure with an increased risk of respiratory problems, cardiovascular diseases, and cancer. It has also been linked to childhood asthma, the development of respiratory allergies, and chronic inflammation in the body. In addition, incense smoke has been indicated to cause allergic contact dermatitis and has been associated with neoplasm.
The toxicities of incense smoke stem from its harmful constituents and deposition capacity in the body. The specific mechanisms underlying these health effects include reactive oxygen species-driven oxidative stress and associated inflammation. While further research is needed, particularly in humans, the growing body of evidence suggests that incense burning may represent a significant public health concern.
To mitigate the potential health risks associated with incense smoke, it is recommended to reduce exposure time in places with heavy incense smoke, such as temples, and to ventilate indoor spaces when burning incense.
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Incense smoke is comparable to or more harmful than passive smoking
While incense has been used for thousands of years for spiritual and hygienic purposes, recent studies have revealed certain health drawbacks. Incense smoke contains particulate matter, which can be easily inhaled and may have negative health outcomes. This particulate matter includes volatile organic compounds, such as benzene, toluene, musk ketones, musk xylenes, musk ambrette, aldehydes, and polycyclic aromatic hydrocarbons (PAHs). These compounds are toxic to the lungs and allergenic to the skin and eyes, causing respiratory system dysfunction and other respiratory problems.
The combustion of incense also produces gas products such as CO, CO2, NO2, and SO2, which are released into the air. Notably, the levels of NOx emitted from Arabian incense were recorded to be higher than those found in environmental tobacco smoke and exceeded government regulation values. Furthermore, incense burning has been associated with increased air pollution, both indoors and outdoors, and the emitted smoke has been linked to an increased risk of numerous health issues.
A study in 2021 confirmed that some of the particulate matter in incense smoke is carcinogenic, meaning it could cause cancer. There is a documented association between incense use and a higher risk of cancer, particularly nasopharyngeal carcinoma in male patients. Additionally, incense smoke has been linked to an increased risk of heart disease and respiratory allergies, including asthma. A 2020 study also found that burning incense may negatively impact brain health in older adults, potentially leading to issues with cognitive performance and decreased brain connectivity.
While incense smoke is not officially deemed a major public health risk comparable to smoking tobacco, the available evidence suggests that it can be equally or even more harmful. The effects of incense smoke may vary depending on whether the individual is a smoker or a non-smoker, with some studies indicating a more pronounced association between incense use and lung cancer in male smokers. However, further research is needed to fully understand the health implications of incense smoke exposure.
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Frequently asked questions
The word "incense", when used as a verb, means to make someone extremely angry. However, there is no evidence that burning incense, an aromatic substance, has a direct impact on human emotions, especially anger.
Burning incense emits smoke and fumes that contain particulate matter, gas products, and organic compounds. These include volatile organic compounds like benzene, toluene, and xylenes, as well as aldehydes and polycyclic aromatic hydrocarbons (PAHs). Incense smoke is associated with respiratory issues, including asthma, allergies, and chronic inflammation. It is also linked to an increased risk of heart disease and, potentially, cancer.
The particulate matter in incense smoke contains irritants and carcinogens, which can lead to respiratory issues. Fine particles smaller than 2.5 μm in diameter can reach the deepest parts of the lungs, accumulating in the respiratory system and causing dysfunction.
Incense burning is a traditional practice in many parts of the world, especially in the East, and is common in religions such as Buddhism, Taoism, and Hinduism. It is used in temples, monasteries, mosques, and households for divine worship, ancestor veneration, meditation, and aromatherapy.











































