Are E Cigarettes a Safe Alternative to Smoking? Using Airway Cell Cultures to Assess Early Indicators of COPD Progression Inquiries Journal Can E cigarettes help COPD patients quit smoking and reduce harm to lungs? Quit Smoking COPD: Long term Nicotine Replacement Doesn't Improve Smoking Cessation RT Cigarette Alternative Inhaler National Emphysema Foundation E cigarettes are Poor Substitutes for Conventional Smoking in COPD Patients