Sage is probably the most common and popular herb for smudging. It is associated with purity and has a strong and heavy presence. It's definitely useful for when you need a major space cleansing.
As the smoke ascends, our wishes and intentions rise and mingle into the universe, connecting heaven, earth, and humanity.
Smoke offerings are found in Buddhism, Indigenous practices in the U.S., and many other spiritual religions. The smoke ceremony creates transformation and blesses a space and the inhabitants.