Don’t smoke, or if you smoke cigarettes, quit. This is the number one step to decreasing chances of lung disease – especially COPD and lung cancer. Avoid second hand smoke. Test your home for radon (while cigarette smoking is by far the greatest risk factor for developing lung cancer, radon is the second leading cause of lung cancer in the United States). Avoid working with asbestos (and if your job requires it wear protective equipment) and protect yourself from dust and chemical fumes. Talk to your doctor about whether influenza and pneumococcal vaccinations are appropriate for you.