It is crucial to identify the putative time-varying population-level factors of age, period, and cohort that influenced the decrease in smoking prevalence so we can maintain the downward trend.
Taken together, consistent reduction in smoking among U.S. adults by all major population characteristics, accompanied by disproportionately larger reduction in smoking propensities among the population sub-groups with initially higher smoking propensity compared to the national average, characterized the decline in overall cigarette smoking.

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They have also documented the burden of tobacco-caused disease and premature death (see Chapter 12, Smoking-Attributable Morbidity, Mortality, and Economic Costs). This chapter summarizes the modeling that demonstrates this burden will persist well into the twenty-first century, absent the acceleration in the decline of cigarette smoking. We employed joinpoint regression analysis, the Cochran-Armitage test, and the Jonckheere-Terpstra test to detect changes in smoking trends and daily cigarette consumption. We found that the overall smoking prevalence declined from 24.46 to 11.46%, with the largest decline in the 1824 age group. Is the decline in cigarette use a positive trend? In conclusion, while the decline in cigarette use among the adult population over the past few decades is a positive trend, it is clear that this decrease is not uniform across all subpopulations. Can cigarette smoking delay the decline in US smoking-related mortality? MeaningThese results suggest that while declines in prevalence among young adults promise a future smoke-free society, slower progress in the age 50 years and older group will delay the decline in US smoking-related mortality. ImportanceThere are still significant population-level health consequences of cigarette smoking in US states. Why did smoking prevalence decrease from 1971 to 2020? More specifically, we observed a decrease in smoking prevalence from 1971 to 2020 because American adults over the age of ~ 27 had a lower probability of cigarette use. The decline, however, has been unequal among birth cohorts (i.e., generations). What drives the downward trend in adult smoking rates between 1971 and 2020? In our present cross-sectional study, we used NHANES dataset and HAPC analysis to extend upon published research and found that the downward trend in U.S. adult smoking rates between 1971 and 2020 is driven mainly by negative period and age effects rather than cohort effect. Smoking Cessation: Fast Facts At a glance Most adults who smoke cigarettes want to quit, and half report trying to quit in the past year. Yet, less than 1 in 10 adults who smoke cigarettes succeed in quitting in a given year. Many adults who smoke do not get the advice, assistance, and treatments that can help them quit for good.

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We employed joinpoint regression analysis, the Cochran-Armitage test, and the Jonckheere-Terpstra test to detect changes in smoking trends and daily cigarette consumption. We found that the overall smoking prevalence declined from 24.46 to 11.46%, with the largest decline in the 1824 age group.
Smoking Cessation: Fast Facts At a glance Most adults who smoke cigarettes want to quit, and half report trying to quit in the past year. Yet, less than 1 in 10 adults who smoke cigarettes succeed in quitting in a given year. Many adults who smoke do not get the advice, assistance, and treatments that can help them quit for good.