...% CI 14–32%) per 10 cigarettes/day smoked by the husband. The estimated increase essentially disappears if proper adjustment is made for smoking misclassification bias, if correction is made for the joint effects of confounding by fruit, vegetables, dietary fat and education, if errors in published...

...John S. Fry; Peter N. Lee Analyses are described estimating the extent to which confounding by dietary variables and education might bias the reported association of smoking by the husband with lung cancer risk in non-smoking women. For each of the four variables fruit, vegetable and dietary fat...

..., particularly due to inadequate control of confounding. Though it is prudent for parents not to expose their children to high doses of environmental tobacco smoke for long periods, the overall epidemiological evidence does not convincingly demonstrate that exposure to environmental tobacco smoke increases...