The overarching goal of the proposed study is to provide information which can lead to effective implementation of cessation support in the care of smokers diagnosed with lung or head & neck cancer.

To achieve these aims, the study propose to conduct a longitudinal cohort study of patients diagnosed with lung or head & neck cancer at the Hospices Civils de Lyon (SMALLHAN). Briefly, adult patients newly diagnosed with lung or head & neck cancer will be recruited at the time of diagnosis (announcement of diagnosis and consultation).

Inclusion Criteria:

• Patients newly diagnosed with lung cancer or head & neck cancer (International Classification of Diseases 10: C76, C34)
• Patients who undergo front-line treatment
• Age 18 years or older
• Benefiting from a Social Security scheme
• Written information about the study provided to the patient before any procedure specific to the study
• Patients who had at least one episode of smoking within the past 30 days before diagnosis

Exclusion Criteria:

• History of another lung or head & neck cancer < 5 years (Note: The presence of a second tumour location, discovered at the same time as the lung or head and neck cancer, does not constitute a non-inclusion criterion)
• History of another cancer (except for curatively treated cervical cancer in situ and non-melanoma skin cancer) < 3 years
• Mesothelioma, thymic malignancies, and cancer of the upper oesophagus
• Inability to complete the study for psychosocial reasons (inability to schedule interview (homeless), no access to phone, psychological disorder leading to inability to answer phone interview, do not speak French and no easy access to translator from surroundings)
• Patient under guardianship
• Patient refusal

.): Patients treated in HCL, newly diagnosed with lung cancer or head & neck cancer (International Classification of Diseases 10: C76, C34) who undergo front-line treatment and who had at least one episode of smoking within the past 30 days before diagnosis

A decision on sharing individual participant data has not yet been made. Data sharing will depend on sponsor policy, ethical approval, and compliance with applicable regulations.