Do Not Smoke
According to the Centers for Disease Control and Prevention, smoking is the number one cause of preventable death and disease in the United States. Smokers who started the habit long before they knew the risks are often unable to quit later in life. In addition to causing lung cancer, smoking has been linked to heart disease, chronic obstructive pulmonary disease (COPD), and stroke. Seeking professional help is recommended for heavy smokers as the addiction is often too hard to deal with alone.