Can NON smokers get lung cancer?

Yes of course and unfortunately its not uncommon
It turns out that more than 60% of new lung cancer patients have never smoked or already have quit smoking you can get lung cancer by being around a family member who smokes or being in a smokey club and many other things ,so yes nonsmokers can -- and do -- get lung cancer. Some cases of lung cancer develop after a long-time smoker has quit, although the risk decreases with time.

Of course, first off, there are some kinds of lung cancer that are not related to smoking, and of those that are, although smoking can raise your risk, in some cases dramatically, the baseline risk is not zero, which means that nonsmokers will develop cancer.
Many times when a person develops cancer, there is no easily identifiable risk factor, it's just bad luck.

Dana Reeve (wife of Superman portrayer Christopher Reeve) died of lung cancer in her mid 40s. She never smoked, did not hang out in smoky bars, and had never lived with a smoker.
Cancer is an equal-opportunity disease, and sometimes rears its ugly head with no known risk factors.

Yes, from radon, a radioactive gas that results from breakdown of uranium. It usually accumulates in unventilated basements. That is a real problem in North Dakota.

Also, cancer can methasthatize from a different organ to the lungs.

Second hand smoke is just as bad as smoking and does cause cancer although the cigarette companies don't want you to really know that!

sure, you can get cancer anywhere

Yes. Second hand smoke can be as bad as being the person actually smoking.

Oh yes, my uncle passed away 2 years ago at the age of 46 from non-smokers lung cancer.

yes, for example, from second hand smoke and other things.