Cigarette smoke irreversibly modifies glutathione in airway epithelial cells American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society The relationship between cotinine levels in the F1000Research Randomized Clinical Trial of How Long Term Glutathione Supplementation Offers Protection from Oxidative Damage and Improves HbA1c in Elderly Type 2 Diabetic Patients Smoking and liver diseases: an updated review of pathogenesis, progression, and therapeutic implications Clinical and Experimental Medicine Springer Nature Link Is It Safe to Combine Glutathione With Other Treatments? Smoking tends to decrease glutathione and increase malondialdehyde levels in medical students Universa Medicina