It's a devastating diagnosis, whatever the reason for it. As said, there are several different types, and even if someone has never smoked, the outcomes of the disease can be just as poor, or even worse. Doctors are searching for answers, particularly where younger women are concerned, because cases are rising. I think Esther Rantzen falls into the non smokers category, and this is the area where more research needs to be done urgently.
The first questions asked are, "Do/Did you smoke?" "Do/Did you have parents with the disease?" From there on it all becomes very unsure, apart from having breathed in particles in an asbestos environment for example.
And offering ct scans to non smokers isnt always the answer because the possible harms of screening can outweigh the possible benefits of finding out early on.