And this.... BUPA resume of research (reasd the whole thing for the dodgy tobbacco-funded research findings!
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"More than 50 studies on the health impacts of passive smoking have been carried out over the past 25 years, including a number of landmark studies providing significant evidence of passive smoking risks. Such work includes research by the International Agency for Research on Cancer (IARC), the Scientific Committee on Tobacco and Health and the ACS.
Notable research includes a study published in the BMJ in 1997, conducted by Hackshaw and colleagues, which analysed 37 passive smoking studies and found a 24 per cent increase in lung cancer among people living with smokers. In fact, said the charity Action on Smoking and Health (ASH), "Tobacco specific carcinogens found in the blood of non-smokers provided clear evidence of the effect of passive smoking."
Additionally, far more reliable data was obtained in the ACS Cancer Prevention Study II (CPS-II) study, which was about 10 times larger than Dr. Enstrom's work. They enrolled patients in the 1980s, when fewer exposures to tobacco smoke outside the home existed, and therefore far less "background noise", and follow-up has been much better (over 99 per cent). The results unquestionably show an increased risk of lung cancer and heart disease."
http://www.bupa.co.uk/health_informa...0503smoke.html