Today was a terrific example of how the popular news media get the meaning of 
scientific statistics wrong. There were reports all over the place that smoked 
and cured meats (like bacon) have been declared by the WHO to be "grade 1” 
carcinogens, along with things like cigarettes and plutonium. "Grade 1” sounds 
very scary and everyone immediately presumed that it means that these meats 
must be very risky. In fact, it means nothing of the kind. Smoked and cured 
meats pose a fairly modest cancer risk. What the "grade 1” means is simply that 
we now have very strong evidence (because of the WHO's meta-analysis of 800+ 
studies) that they increase your cancer risk somewhat. The actual risk they 
pose is still much lower than the risk posed by cigarettes or, for heaven's 
sake, plutonium. Indeed, we now have very strong evidence that the risk is much 
lower. Here's an article that clarifies things, from The Guardian (which, by 
the way, probably has the best science coverage of any English language 
newspaper in the world).

 - Chris

.......

Christopher D Green

Department of Psychology
York University
Toronto, ON   M3J 1P3
43.773759, -79.503722

[email protected]
http://www.yorku.ca/christo
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