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 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 Disturbances of the Lung Glutathione System in Adult Guinea Pigs Following Neonatal Vitamin C or Cysteine Deficiency Lung glutathione and oxidative stress: implications in cigarette smoke induced airway disease American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society HXN NAC Supplement, N acetyl cysteine, Glutathione for lungs Detox, with Vitamin C Tablet, (99% NAC Supplement) Support Immunity, Respiratory Health Supplements 60 Tablets : Amazon.in: Health & Personal Care Adding glutathione to parenteral nutrition prevents alveolar loss in newborn Guinea pig ScienceDirect