[ 3 ] demonstrate a significant trend between COPD and the amount of tobacco smoking; people consuming over 30 pack–years have a median (interquartile range); 3.73 (2.62–5.29) higher risk of developing COPD [ 4 , 5 ].
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[ 3 ] demonstrate a significant trend between COPD and the amount of tobacco smoking; people consuming over 30 pack–years have a median (interquartile range); 3.73 (2.62–5.29) higher risk of developing COPD [ 4 , 5 ].