Lungs are vital in helping to maintain normal body operations. The lungs are responsible for oxygenating the blood, which then circulates to the rest of the body. Maintaining healthy lungs can help keep your entire body healthy. In order to keep your lungs healthy it is best to avoid things that negatively affect them. The three most harmful things for our lungs are smoking, dust, and excessive cold, but there are a number of other factors which can also be a problem for lung health, such as toxins, pollutants and illnesses like asthma, bronchitis, emphysema, chronic obstructive pulmonary disease and pneumonia. Maintaining healthy lungs requires exercise and a healthy diet that provides vitamins, minerals, and other nutrients.