RT Journal Article SR Electronic T1 Health consequences of smoking 1–4 cigarettes per day: response to G F Cope (eletter to journal) JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 71 OP 72 DO 10.1136/tc.2005.014589 VO 15 IS 1 A1 K Bjartveit A1 A Tverdal YR 2006 UL http://tobaccocontrol.bmj.com/content/15/1/71.2.abstract AB