What is amazing is that the WHO report on the effects of second-hand smoke wasn't "downplayed." It was so thoroughly buried, that it has been impossible for me to ever find a complete copy of it including tables and appendices.
Isn't it astounding that Assange has managed to get national defense secrets, hundreds of thousands of items, perhaps up to a million, and no one has been able to sneak a single complete copy of the UN WHO study of 1999?
There never was as thorough a study of second hand smoke before the WHO study, and it's not likely there will ever be a truly politically and PC-free study any time soon.
The WHO study, as I recall, covered 15-20 years of constant follow up of tens of thousands of individuals of all ages.
Howerver, here's a tantalizing glimpse :