Smoking duration alone provides stronger risk estimates of chronic obstructive pulmonary disease than pack-years
Surya P Bhatt, Young-il Kim, Kathy F Harrington, John E Hokanson, Sharon M Lutz, Michael H Cho, Dawn L DeMeo, James M Wells, Barry J Make, Stephen I Rennard, George R Washko, Marilyn G Foreman, Donald P Tashkin, Robert A Wise, Mark T Dransfield, William C Bailey
Thorax May 2018, 73 (5) 414-421; DOI: 10.1136/thoraxjnl-2017-210722