According to a recent study inhalation of incense over long periods may lead to cancer of the upper respiratory tract. The incense smoke doesn’t apparently lead to increased risk of lung cancer.
The type of incense used isn’t mentioned. Cheaper quality charcoal and incense ingredients should be avoided when one is purchasing incense. Some incense producers using inferior ingredients and extend their use adding various extenders, such as DPG (dipropylene glycol methyl ether).

DPG Signs and symptoms of exposure from Osha.gov

1. Acute exposure: Irritation of the eyes, nose, and throat may occur and be associated with symptoms of burning, itching, runny nose, and nose and throat soreness. At very high concentrations, central nervous system impairment may occur with sleepiness, headache, inability to concentrate, and other symptoms of narcosis [Sittig 1991].

2. Chronic exposure: No signs or symptoms of chronic exposure to dipropylene glycol methyl ether have been reported in humans.

Potassium nitrate is another chemical that is often used in the manufacture of charcoal.

Incense is wonderful to cleanse your space to uplift the vibration and also useful to change your mood to a more tranquil state. Incense is also synonymous with religious/spiritual ceremony.

To make your incense experience healthy seek out quality blends made with quality ingredients.