Smelling incense for a long time will increase the risk of upper respiratory diseases. Incense is a kind of perfume which is made from the original fragrant materials and spices through simple processing such as cleaning, drying and cutting. Incense is a very popular activity in ancient times, especially in the life of nobles and literati, and it is a necessary daily necessities for them to keep healthy at home and cultivate their sentiments.

Under long-term incense, it is easy to lack oxygen, which causes skin sensitivity and even leads to "getting angry". Some incense sticks are collided, mixed and even toxic, so be careful when choosing incense sticks. It is best to consult professionals about matters, such as the time of incense and the collocation of incense.

Incense candles also contain a variety of harmful substances such as acetone, phenol, toluene, benzyl acetate, limonene, etc., which will interfere with the hormone balance in the body and increase the risk of asthma, chronic lung disease, allergic reaction and other diseases.

A research report of the U.S. Environmental Protection Agency pointed out that burning candles (especially scented candles) is the main source of carbon and metal particles in indoor air, which may lead to excessive content of heavy metals such as lead in indoor air and pose serious harm to health.