Ozone enters the body when you breathe. As it travels through the mouth and nose’ ozone reacts with the linings of airways and starts chemical reactions which cause the tissues to break apart and then recombine with the excess oxygen. This recombination compromises the structure of the linings, which normally act to keep bacteria and other microorganisms from entering the lungs. The airways react to this change by producing excess amounts of mucus and constricting to reduce the flow of air through our lungs. The physiological effects can vary widely between individuals and can result in shortness of breath, wheezing, asthma, and may even lead to pulmonary infection and an increased risk of heart attack.