Up to 25% of lung cancers now occur in people who have never smoked and most often in women, people of Asian descent, and people with a family history of lung cancer, according to the National Institutes of Health.

“Lung cancer in never-smokers is emerging as a separate disease entity with distinct molecular characteristics that directly impact treatment decisions and outcomes,” Andreas Wicki, an oncologist at the University Hospital Zurich, Switzerland, told the BBC.

“When we see 30- or 35-year-olds with lung cancer, they are usually never-smokers,” he said.

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