1 . Smoking is a major cause of lung cancer and chronic obstructive pulmonary disease (COPD), which includes chronic obstructive pulmonary disease and emphysema.  2 . Cigarette smoke can shorten the airway and make breathing difficult. It causes chronic inflammation, or inflammation in the lungs, which can lead to chronic illness. 3 . Cigarette smoke, home, and work chemicals, and radon can all cause or exacerbate lung disease. Make your home and car smoke-free. Check your home with radon. Avoid exercising outdoors on bad weather days. 4 . Outdoor air quality can vary from day to day and is sometimes unhealthy to breathe. Knowing how external air pollution affects your health and practical strategies to reduce long-term exposure can help keep you and your family healthy. Climate change and natural disasters can also have a direct impact on lung health. 5 . Whether you are young or old, thin or tall, strong, or have a chronic illness or disability, exercise can help keep your lungs healthy.