Introduction:
Lung cancer is the most common cancer among males worldwide and one of the most common cancers among females. Poland is among European countries of the high risk of lung cancer for men. Although there are several factors influencing the risk of developing lung cancer, tobacco smoking is well established as the main risk factor. Thus, changes in lung cancer mortality may reflect changes in smoking habits in a given population.

Methods:
The population data and its forecast up to 2030 come from the Central Statistical Office and the lung cancer mortality data from the Department of Epidemiology of Maria Skłodowska Institue – Oncology Centre. The frequencies of smoking habits were smoothed based on the survey done by Central Statistical Office in 1996, 2004, 2009, 2014. The present model was based on model-based smoothing of the smoking habit – specific risk ratios estimated for males and females in Europe.

Results:
Among men, the scenario in which about 20% of smokers quit smoking every 5 years turned out to be too pessimistic. The real change in lung cancer mortality turned out to be deeper. In 2015, lung cancer mortality among men was more than 25% lower than it was from the forecast. Among women, a scenario in which only 10% quits smoking works. This is too little to reduce women's lung cancer mortality.

Conclusions:
The results obtained clearly indicate that cutting down on the number of smokers translates directly into a considerable reduction of the lung cancer incidence rate. Lung cancer is a disease to be easily avoided. Smoking cessation is the best way to reduce risk of lung cancer among human population.