CIGARETTES may contain traces of pigs' blood, an Australian academic says with a warning that religious groups could find its undisclosed presence "very offensive".

University of Sydney Professor in Public Health Simon Chapman points to recent Dutch research which identified 185 different industrial uses of a pig - including the use of its haemoglobin in cigarette filters.

Prof Chapman said the research offered an insight into the otherwise secretive world of cigarette manufacture, and it was likely to raise concerns for devout Muslims and Jews.

* Cigarettes may contain blood - research
* "Insight into world of cigarette manufacture"
* Likely to raise concerns for Muslims, Jews
Cigarettes may contain pig blood | News.com.au