Spousal ETS exposure was associated with 25% higher CHD risk; leaves open causal inference from observational meta-analysis alone.
Michael Thun, Jane Henley, Louis Apicella, Epidemiologic Studies of Fatal and Nonfatal Cardiovascular Disease and ETS Exposure from Spousal Smoking, Environmental Health Perspectives, Vol. 107, Supplement 6 (Dec., 1999), pp. 841-846
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