What is the life expectancy of lung cancer victim who keeps smoking?

Depends on stage: Wil depend on the type , the stage of lung cancer, how good overall condition of the patient and other comorbidities/medical problems of the patient. If you continue to smoke, the response of the cancer to the cheno will be lower than if you quit smoking. Also, your risk for recurrence and to develop other primary lung cancer and other episode of smoking related cancer will be high.

Depends: Depends on the stage and treatment of the cancer. A few months if it is metastatic, but possibly cured if it is stage i and removed surgically. But - studies have shown that the survival is decreased in smokers and the complications from surgery and other treatments are higher in smokers. Additionally, smokers may get second cancers in many places or die of cardiovascular disease after curative.

Likely short: About half the patients with lung cancer are gone within a year of diagnosis. Keeping up smoking will add to the lung damage, cause heart disease and other pathologies, and reduce the life span even if the person beats the cancer.