The lungs are a part of the body with the primary role is to exchange gases – bringing oxygen from the air into the pulmonary veins, and CO2 from pulmonary arterial to outside. Besides lung are also some other minor ability to help metabolize some biochemical substance, filtering some toxins in the blood. The lungs are also a place store blood (according to Wikipedia). With heavy and so important duty, to be able to work for long and accurate, lungs need our proper attention, avoid adverse impacts from outside. Science 247 introduces to you the things to consider keeping your lungs healthy through the years. http://howtoquitsmoking24h.com/keep-your-lungs-healthy.html