The following study was carried out in China to discover whether passive smoking at work is a risk factor for coronary heart disease. Of course, the results also apply to any other country where smoking at work can risk the health of non-smoking workers.
ttp://www.bmj.com/cgi/content/full/308/6925/380
The conclusion was that passive smoking at work is a risk factor for coronary heart disease. Urgent public health measures are needed to reduce smoking and to protect non-smokers from passive smoking in China.