Article Text
Causation
Multiple attempts to stop smoking, even with relapses, reduced loss of pulmonary function
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Footnotes
Sources of funding: Division of Lung Diseases of the National Heart, Lung, and Blood Institute; Boehringer Ingelheim Pharmaceutical, Marion Merrell Dow, and Merrell Dow Pharmaceuticals (Canada) contributed drugs used by the study.
For correspondence: Dr R P Murray, Section of Clinical Epidemiology and Outcome Evaluation, Room MS754, Health Sciences Centre, University of Manitoba, 820 Sherbrook Street, Winnipeg, Manitoba R3A 1R9, Canada. Fax +1 204 789 3905.
↵* Anthonisen NR, Connett JE, Kiley JP, et al for the Lung Health Study Research Group. JAMA 1994;272:1497–505.