Increasing frequency of non-smoking lung cancer: Presentation of patients with early disease to a tertiary institution in the UK.

•Never-smokers with lung cancer often present late as there are no established aetiological risk factors.•The annual frequency of developing lung cancer in never-smokers increased from 13% to 28%.•This is attributable to an absolute increase in numbers and not simply a change in the ratio of never-smokers to smokers.•Presenting features were non-specific and majority were detected on incidental imaging.•We observed more than a double the annual frequency of lung cancer in never-smokers in the last 7 years.