Sage (Ancient Art of Smudging) Sage is commonly recognized for space purifying. Recent studies have shown that there is scientific evidence that this medicinal smoke is a powerful antiseptic that can purify the air of 94% of harmful bacteria for up to 24 hours. Burning sage or other herbs neutralizes the positive charge and releases large amounts of negative ions into the atmosphere. This means that our own energy, and the energy around us, will feel lighter and freer.