More evidence that second-hand smoke may harm kids

The result of this study is insignificant.
After controlling for sibling and peer smoking, and susceptibility to initiating smoking, exposure to SHS in a motor vehicle was independently associated with ND symptoms (OR, 95% CI = 1.2, 1.0–1.4). The OR for number of persons who smoke inside the home was 1.1 (0.9–1.4).
Is it not strange that the effects on children seem to be greater when exposed in a car than at home. Were these kids more and longer exposed in a car than at home?
In another article about this study it is stated: Researchers did not make a direct link between cause and effect, Belanger said. (This means we have proven nothing) "More studies are needed. (This means, we need more money). This study should have gone straight into the bin. Results are not surprising as the researchers have a conflict of interest. They work for tobacco control. Their aim is: Strengthening the links between research, practice and public policy to reduce the burden of smoking.