What is the percentage of lung cancer patients that are smokers?

I would like to know the ratio of smoker vs non smoker in people diagnosed with lung cancer. Please provide a link.
I'm not looking for "caused by smoking" , those stats can be spun. I'm looking for smokers vs non smokers strictly. What percentage?

Lung Cancer Nursing Considerations and Management

Nursing Considerations for Lung Cancer Patients

Preventing Lung Cancer: What You Need to Know

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Breakthroughs in Lung Cancer Research

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Understanding Lung Cancer

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Early Detection and Treatment of Lung Cancer

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Living with Lung Cancer: A Survivor’s Story

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