1, chemical incense. As the name implies, the simulated fragrance of chemical substances is generally slightly toxic and will pollute the environment.
2, inferior fragrance. The fragrance made of inferior spices is either cheap or expensive.
3, high quality incense. It is really fragrant. It is made of high-grade spices, which not only smells good, but also has the functions of refreshing, calming and sterilizing, such as agarwood and sandalwood.