How Is It Possible That Healthy People Can Get Cancer?

Despite healthy people eating the right and healthy foods with good exercise, how is it possible that these people who take good care of themselves get cancer?
But isn’t it suppose to be the other way around? In other words, I mean that people who don’t take care of their health and eat fatty, unhealthy foods get cancer. I doesn’t make sense when healthy people like healthy non-smoking, healthy people get lung cancer.
I know the causes of cancer is to eat unhealthy foods and not do many healthy activities.
But my question is……
What is the cause of lung cancer for people who are non-smokers and take good care of their health? The wife the actor Christopher Reeve(Dana Reeve) died from lung cancer even though she was a non-smoker and a very healthy person.
When you choose to answer my question, don’t answer with “that’s how life is” or “that’s the way it is” or “life is unfair”. Please give a specific and elaborate answer to my question.
Is nature responsible?

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