Best estimates of coronary risk of passive smoking are needed

doi:10.1136/bmj.329.7471.918-b

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Ruoling Chen (Ruoling.Chen@Westminster-pct.nhs.uk), honorary senior lecturer,
Hugh Tunstall-Pedoe, professor of cardiovascular epidemiology,
Roger Tavendale, biochemist

Department of Epidemiology and Public Health, University College London, London WC1E 6BT
Cardiovascular Epidemiology Unit, Institute of Cardiovascular Research, University of Dundee, Ninewells Hospital, Dundee DD1 9SY

EDITOR—Whincup et al show passive inhalation of environmental tobacco smoke to be an unexpectedly strong risk factor for coronary heart disease, when assessed using serum cotinine concentrations, in contrast to Enstrom and Kabat, who did not.1 2 They emphasise the need for further prospective studies using biomarkers.

We measured serum cotinine concentration and other biomarkers of smoking at …