Disadvantages of SMOKING 1: LUNG CANCER: Smoking is the No.1 cause of Lung Cancer. Treatable by a medical professional Requires a medical diagnosis Lab tests or imaging often required Two major types of lung cancer are non-small cell lung cancer and small cell lung cancer. Causes of lung cancer include smoking, second-hand smoke, exposure to certain toxins and family history. Symptoms include a cough (often with blood), chest pain, wheezing, and weight loss. These symptoms often don’t appear until the …