RT Journal Article SR Electronic T1 Smoke screen award JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 56 DO 10.1136/tc.2.1.56b VO 2 IS 1 A1 S. D. Sandell YR 1993 UL http://tobaccocontrol.bmj.com/content/2/1/56.2.abstract AB