NAC is a great supplement. It's awesome stuff to support healthy lungs. NAC is a known mucolytic. That is a fancy term meaning breaking up mucus. Now, research does show that NAC PDF] Environmental toxicity, redox signaling and lung inflammation: the role of glutathione. Semantic Scholar Oxidative Stress and Inflammation in Acute and Chronic Lung Injuries Met Tathione Lung glutathione and oxidative stress: implications in cigarette smoke induced airway disease American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society Have You Tried Taking Whitening Capsules? Lush Angel