Burning incense can potentially have negative health effects, depending on various factors.

Firstly, burning incense produces smoke, which can be an irritant to the respiratory system. This is particularly problematic for people with existing respiratory conditions such as asthma or allergies.

Secondly, some types of incense contain chemicals that can be harmful when inhaled in large amounts. For example, some incense contains benzene and formaldehyde, which are known carcinogens.

Thirdly, burning incense can release particulate matter into the air, which can be harmful to health when inhaled. This can be especially problematic in poorly ventilated spaces or if incense is burned for prolonged periods.

Finally, some people may be sensitive to the fragrances or chemicals in incense, which can trigger headaches or other symptoms.

Overall, while burning incense in moderation is unlikely to cause significant harm, it is important to consider the potential health risks and take appropriate precautions, such as ensuring good ventilation and avoiding prolonged exposure.