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Oxygen passes into the alveoli, and carbon dioxide passes out

Thomas McLaren, a cardiothoracic radiologist who is an assistant professor of radiology and cardiology at Vanderbilt University Medical Center

Along with increased infections, people who smoke are at higher risk for chronic nonreversible lung conditions such as: emphysema, the destruction of the air sacs in your lungs chronic bronchitis, permanent inflammation that affects the lining of the breathing tubes of the lungs chronic obstructive pulmonary disease (COPD), a group of lung diseases lung cancer Withdrawal from tobacco products can cause temporary congestion and respiratory discomfort as your lungs and airways begin to heal

He greeted several of his kinsmen by name and probed his way among the prostrate, intoxicated bodies in the pitch black, finally taking his place in the center of the group alongside his younger brother, Shantanta