Smudging is a beautiful symbolic exercise found in Feng Shui, many native American traditions and alternative healing practices like Ayurveda.
It involves burning selected herbs or other materials in a manner that fills the home or other space with the fragrance of the smoke, and it is thought to clear negative energy.
I like to use sage sticks or eucalyptus. Paleo Santo wood sticks are also very pleasant.
It's a great meditative session to go through your sacred spaced and disperse the smoke in every single room without forgetting the 4 corners.