In severe copd, your lungs are functioning at less than 30 percent of normal capacity. share on pinterest. copd prevention. eat a healthy, well-balanced diet ;. See more videos for healthy lungs vs bad lungs. "it also clears out your lungs by forcing enough stale air out that it allows fresh air to enter into more areas of the lung. " 7. staying active "regular moderately intense activity is great for the healthy lungs vs bad lungs lungs, and when you increase your daily activity you get three things done at once: healthy lungs, a healthier heart and a better mood," ryan says. Maintaining the health of the lungs is essential for keeping the rest of the body healthy. according to the world health organization (who), exposure to air pollution results in 4. 2 million deaths. the same respiratory problems tobacco smokers do including lung infections and a diminished immune system, according to the national institute of health many also assume that since marijuana ...