RT Journal Article SR Electronic T1 Clearing the Air. A Guide for Action on Tobacco JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 688 OP 688 DO 10.1136/thx.46.9.688-d VO 46 IS 9 A1 JM YR 1991 UL http://thorax.bmj.com/content/46/9/688.5.abstract AB