Vitamin C helps our body in different ways and preventing your lungs from chronic diseases is one of them. Sufficient intake of this vitamin, in a day, can boost your immune health and promote collagen formation in the skin. Presence of free radicals and toxins in the lungs due to smoking and pollution can lead to inflammation in the body. Vitamin C, which is mainly present in citric fruits, fights back against free radicals and toxins and also helps your body get rid of these potentially damaging molecules. It further lowers down the lung tissue damage rates, providing an opportunity to the body to repair itself. As per a 2014 study, published in the journal Allergy, Asthma & Clinical Immunology, vitamin C may improve lung function and cut the incidence of respiratory symptoms by half during and after exercise. The major potential benefits of this nutrient are due to its antioxidant content. Have citrus fruits, chilli peppers, guava, kiwi, broccoli, kale and berries to get more of this nutrient.