The health risks of passive smoking. The growing case for control measures in enclosed environments.

6From the Department ofMedicine, University ofWestern Ontario, London, Ontario, and the Department ofPreventive Medicine and Biostatistics, University ofToronto, Toronto, Canada. tProfessor of Medicine. IProfessor and Chairman, Department of Preventive Medicine and Biostatistics. §Assistant Professor of Epidemiology and Biostatistics and of Medicine, University of Western Ontario. IIProject Manager, Health Promotions and Information Branch, Ministry of Health, Toronto. Reprint requests: Dt Lefcoe, Westminster Ho itaL, London, Ontario, Canada N6A 4S2