Smoker lungs aren't a lost cause. NAC and mullein leaf is the stack nobody talks about. NAC thins mucus and bumps glutathione back up. Mullein calms inflamed airways so the morning cough what to avoid when taking glutathione Patchmd Cigarette smoke irreversibly modifies glutathione in airway epithelial cells American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society Cigarette smoke extract induced exosome release is mediated by depletion of exofacial thiols and can be inhibited by thiol antioxidants ScienceDirect