Various types of Incense are made with Aromatic Plants, Oils and Resins that emit Pleasant Aromas when combusted or heated. Obviously, there are also Poor Quality Incense which are produced using Chemicals and emit Toxic Air Pollutants. These pollutants are not only harmful to People, but also to our Pets.
When burned, Poor Quality Incense can produce Volatile Organic Compounds such as Benzene, Formaldehyde, Butadiene and Styrene, along with Toxic Gases like Carbon Monoxide and Carbon Dioxide, according to a Website article published in the May 2013 issue of "Environmental Monitoring and Assessment." These chemicals are harmful to both People and Pets but because the lungs of our Pets are More Sensitive to Environmental Pollutants than those of Humans, the Toxic Gases emitted from Incense may have a Greater Effect on them, according to several Animal Advice websites.
Therefore, when burning Incense inside your home, do it in a well-ventilated area, because Pets have a much more Sensitive Sense Of Smell than humans, the Scent Of Aromatherapy products like Incense may bother them, causing similar issues to Humans like Headaches, according to Radford G. Davis in "Caring for Family Pets."
In addition, it is wise to keep any Incense out of your Pet's reach so that he doesn't accidentally ingest it, which may cause some tummy upset.