Is it possible to get lung cancer if you've never smoked before?

Yes: 13% of lung cancer is not caused by smoking. There is a rising incidence of lung cancer in never smokers (<100 lifetime cigarettes) in the United States. This may be due to genetic factors and/or environmental factors. In regards to second hand smoke, there are 3000 lung cancer deaths per year due to second hand smoke.

Yes...: Both environmental (asbestos, radon, other people's smoke, and many heavy metals and likely pollutants) and genetic ( new molecular based understanding of the epidermal growth factor receptor, path and mutations, and other molecular causes exciting researchers).

Unfortunately yes: There are many different risk factors and there are unfortunately many non-smokers that get lung cancer. The largest group of non-smokers to get lung cancer are women.