Analysis of Passive Smoking and Breast Cancer of Limited Value

Author Affiliations: Science Integration Division, Centre for Chronic Disease Prevention and Control, Public Health Agency of Canada, Ottawa, Ontario, Canada (Dr Johnson); Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada (Dr Miller); School of Public Health, University of California, Berkeley (Dr Hammond); and Canadian Expert Panel on Tobacco Smoke and Breast Cancer Risk and Physicians for a Smoke-Free Canada, Ottawa (Mr Collishaw).