Smoking poses severe dangers to lung health, including: 1. Lung Cancer Smoking is the leading cause of lung cancer, increasing the risk of developing this deadly disease. 2. Chronic Obstructive Pulmonary Disease ( The evidence is clear: Young E cigarette users suffer from respiratory symptoms American Lung Association Tobacco Smoke, Vaping, and Asthma AAFA.org Health Effects of Cigarettes: Chronic Obstructive Pulmonary Disease (COPD) Smoking and Tobacco Use CDC Can E Cigarette use be Beneficial to Patients with COPD? Red Vape Vaping and COPD