Asthma is one of most common respiratory system health hazards in our society lately. Asthma is a chronic disease of the airways that makes breathing difficult. Honestly, many researchers can't explain the reason for why it is so common. They do have many theories though, some say that the air quality and pollution can cause much harm to us. Two other theories about asthma being so common suggest that the small space of our homes, as well as the materials that make up our homes, promote the development of asthma. Researchers suggest that when certain populations of people moved from living mostly outdoors in villages to living mostly indoors in confined living quarters, the rate of asthma in the population increased significantly, therefore
