RT Journal Article SR Electronic T1 Smoking and COPD: what really are the risks? JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 883 OP 884 DO 10.1183/09031936.06.00074806 VO 28 IS 4 A1 Marsh, S. A1 Aldington, S. A1 Shirtcliffe, P. A1 Weatherall, M. A1 Beasley, R. YR 2006 UL http://erj.ersjournals.com/content/28/4/883.abstract AB