Your life style affects your respiratory condition much.Stay away from kitchen fumes,cigarette smoke ,dust etc.
Transition from village life to urban life is another important cause.
Psychosomatic factors play a huge role in many cases of respiratory distress and a positive frame of mind is of major help. For this you can indulge or organize certain activities like, laughing.Laughing helps your lungs to relax ,its also said that laughing can increase your life span. Bringing radical changes in the life style can keep away asthma. Performing and practicing yoga and other exercise is a good option. Dont hesitate to see your doctor for a treatment if necessary.