Looking at medical records from women between 2000-2010 showed they were 25 times more likely to die from lung cancer than their non-smoking friends.

BBC: Female smoking death risk 'has soared'

It has long been the consensus in the medical profession that passive smoking is dangerous, so there was outrage when the British Medical Journal of May 17th published a study which found that non-smokers whose spouse smoked did not suffer lung cancer or other smoking-related diseases as a result.

ECONOMIST: Ups and downs for Big Tobacco