MRI scans show second-hand smoke damages lungs - Daily Mail 27th November 2007

One third of people who breath in high levels of secondhand smoke have damage to their lungs similar to that seen in smokers, doctors have reported. A team of experts used a special kind of magnetic resonance imaging (MRI) scan to look at the lungs of non-smokers who had high exposure to other people's cigarette smoke and found evidence of the kind of damage that causes emphysema.

Link to Article