The trend in smoking rates and the number of lung cancer deaths follow approximately the same pattern,except that

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Studies have shown that there is a lag time of about 25 to 30 years between increased smoking rates and the corresponding increase in lung cancer deaths. This is because it takes several years of smoking for lung cancer to develop, and even after quitting smoking, the risk of developing lung cancer remains high for several years. Therefore, while smoking rates have been declining in recent years, we will continue to see a high number of lung cancer deaths for some time due to the past prevalence of smoking.

The Trend in Smoking Rates and the Number of Lung