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One of the other major changes exercising will bring to a smoker is the increase in lung health. When a person engages in strenuous activity, the lungs allow for more air to be sucked in, so that more oxygen will be distributed throughout the body. Smoking does cause the lungs to toughen up, sometimes to the point they are no longer able to expand properly to bring in additional air.
Regular exercise will keep the lungs from becoming too damaged from this occurrence. By working out until air is being breathed in at a rapid pace, the lungs will constantly be forced to adapt. Thus, they will never be able to fully be victimized by the tar that can begin to form on the lungs. This ensures your body will always be capable of breathing in and distributing the oxygen necessary for the body to keep a healthy balance.