First
-Avoid smoking,drinking alcohols and inhaling chemicals.
Second
-Always drink water that has a gram half of your weight.For example you are 50 kg,drink 25 grams of water.
Third
-Always do excercises to make the blood circulation better.
Fourth
-You should also avoid having cough to maintain the cleanliness of your lungs from pleghm.
Fifth
-Do regular check-ups.
