Sage has a long history of medicinal use for ailments ranging from mental disorders to gastrointestinal discomfort. It has a long history of use in Egypt, Rome, and Greek medicine, as well as within Native American healing traditions. Burning sage, also known as smudging, involves literally burning the sage leaves and letting the smoke purify the air in your home. Sage is thought to have antimicrobial properties that help kill bacteria, viruses, and fungi. That being said, it’s important to keep in mind that burning sage will create smoke, which can cause health problems for individuals who are prone to asthma and other respiratory conditions.