Official Reports of the US Surgeon General
Commencing with the 1964 report
http://www.cdc.gov/tobacco/data_statistics/sgr/index.htm
National Cancer Institute's Tobacco Control Monograph Series
Some monographs in this series review health effects of tobacco use
https://cancercontrol.cancer.gov/brp/tcrb/monographs
International Agency for Research on Cancer
IARC monographs including
IARC Scientific papers including
California Environmental Protection Agency's (Cal/EPA): Health effects of exposure to environmental tobacco smoke: Final Report, approved at the Panel's June 24, 2005 meeting
http://www.oehha.ca.gov/air/environmental_tobacco/2005etsfinal.html