Lungcapacity And Aging American Lung Association Total lung capacity. the total lung capacity (tlc), or the total amount of air you can breathe in taking the deepest breath possible is decreased by smoking in several ways. smoking can result in damage to muscles in the chest reducing the expansion necessary to take a deep breath. Overview. your lung capacity is the total amount of air that your lungs can hold. over time, our lung capacity and lung function typically decrease slowly as we age after our mid-20s. The four lung capacities are: inspiratory capacity. vital capacity. functional residual capacity. total lung capacity. inspiratory capacity (ic) inspiratory capacity is the volume of air that can be inspired from the end of the tidal expiration or volume of air that can be inspired forcibly after a normal inspiration. typhoid marys of our day to stop pitching what they catch the law that once ordered a healthy henning jacobson to roll up his sleeve can no longer compel a vir...