A substance that is burnt to produce a sweet smell, especially as part of a religious ceremony. (Cambridge Dictionary)
Material used to produce a fragrant odour when burned. (Merriam – Webster)
The perfume exhaled from some spices and gums when burned. (Merriam – Webster)
Pleasing attention: Flattery. (Merriam – Webster)
A gum, spice, or other substance that is burned for the sweet smell it produces. (Oxford Dictionaries)
The smoke or perfume of incense. (Oxford Dictionaries)
Incense is a substance that is burned for its sweet smell, often as part of a religious ceremony. (Collins Dictionary)
Examples
Close up of burning incense sticks with smoke over black background,rotating.

https://www.videoblocks.com/video/close-up-of-burning-incense-sticks-with-smoke-over-black-backgroundrotating-o672ylx
Is Breathing Incense a Health Risk?

https://parade.com/11659/marilynvossavant/is-breathing-incense-a-health-risk/