Cancer
Lung Cancer See All Overview See All Understanding Your Diagnosis See All Deciding on Treatment See All Managing Side Effects See All Prevention and Screening See All Cancer FAQs See All Anatomy of the Respiratory System in Overview A detailed look at the respiratory system and how it works....more Smoking and Respiratory Diseases in Overview Diseases caused by smoking kill more than 480,000 people in the U.S. each year. Here's a look at the risks linked to smoking, as well as information to help you quit.