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 ( Chronic Obstructive Pulmonary Disease (COPD). Some diagnoses become so common that we stop questioning them. An elderly smoker with breathlessness? COPD. A wheezy patient in the emergency? COPD exacerbation. But bedside medicine What COPD Patients Should Know About Vaping and E Cigarettes LPT Medical The Impact of E Cigarettes and Asthma: What You Need to Know