2006 Surgeon General's Report on Secondhand Smoke: 
The Health Consequences of Involuntary Exposure to Tobacco Smoke

This is the most comprehensive and most authoritative report on the health effects of secondhand smoke. Released June 27, 2006, it is an update of the landmark 1986 Surgeon General's Report on the same topic.

• Executive Summary (PDF file)
• Full Report (PDF files for each chapter, 709 pages total)
• Six Major Conclusions
• Secondhand Smoke - What It Means to You (20-page booklet based on the 2006 Surgeon General's Report)