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Quitting Smoking Improves Lungs Quickly

A study published in the July 2006 edition of the American Journal of Respiratory and Critical Care Medicine has shown that lung function improves within six weeks of quitting smoking.

They measured FEV1, which stands for forced expiratory volume in one second, with a device called a spirometer. FEV1 is the amount of air you can blow out of your lungs in one second. A low FEV1 usually indicates the lungs are narrowed from inflammation or bronchoconstriction (tightening of the airways). There was a substantial increase in FEV1 in those people in the study who quit smoking.

This study shows not only that some of the lung damage from smoking is reversible, but that this improvement occurs fairly quickly.

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