Awareness of risk factors for five common cancers was assessed in a represe
ntative sample of 3 693 adults in the UK. Respondents were presented with a
risk of 14 factors comprising IO which have established links with Various
cancers (older age, many sexual partners, low fibre diet, smoking, a relat
ive with the cancer, low fruit and vegetable diet, taking HRT/the contracep
tive pill, being overweight, viruses or infection, and a high fat diet) and
four so-called 'mythic' caused (food additives, overhead power lines, poll
ution, stress). Out of 15 well-established associations between risk factor
s and cancers, the average number correctly identified was 5. Women and tho
se with higher levers of education got more correct. Endorsement of mythic
causes was comparatively low (less than 5% for most cancers), but were high
er in men and those with less education. These results are somewhat reassur
ing in relation to the prevalence of erroneous beliefs, but raise considera
ble concern about public understanding of well established causes. Better h
ealth education will be needed to maximise public awareness of cancer preve
ntion.