[Smoking cessation in smokers under treatment for lung cancer. Current data].

In 2020, lung cancer was the cause of 18 % of all cancer deaths; smoking accounting for around 90 % of all lung cancers. Despite advances in lung cancer treatment, tobacco control measures are the most effective in curbing the lung cancer epidemic. Nevertheless, smoking cessation at all stages of the cancer process is associated with benefits in terms of cure, improved life expectancy and quality of life for patients, reduced medical or surgical complications, and reduced risk of recurrence or occurrence of a second primary cancer. Consequently, smoking cessation is an essential component of lung cancer treatment. All healthcare professionals, particularly those involved in the care of lung cancer patients, must help smokers to quit.