Active and Passive Cigarette Smoking and Breast Cancer Recent studies may explain inconsistencies between previous results, say researchers, and a real risk may be emerging. http://www.mja.com.au/public/issues/172_11_050600/burton/burton.html
Ask the Expert: Breast Cancer and Secondhand Smoke Summarizes the research findings on tobacco smoke as a cause of breast cancer. http://www.oncolink.com/templates/experts/article.cfm?c=3&s=13&ss=22&id=1179
Is There An Association Between Passive Smoking and Breast Cancer? Scientific article; meta-analysis of 11 studies estimates a 40% higher risk of breast cancer as a result of exposure to secondhand smoke. http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11484800&dopt=Abstract