Study: No lung cancer increase for non-smokers

The report cites research linking lung cancer to smoking but it debunks a theory that lung cancer rates among non-smokers are increasing.

One of the key authors found the great majority of lung cancers are caused by smoking.

The study is the most comprehensive global snapshot ever taken, representing data from more than 2 million lung cancer cases on four continents.

The findings are published in the September issue of PLoS Medicine.