A recent study published in The Lancet Public Health journal by the Global Burden of Disease, Injuries and Risk Factors (GBD) Tobacco Forecasting Collaborators suggests that intensifying efforts to reduce global tobacco smoking to a prevalence of 5% could significantly enhance life expectancy and avert millions of premature deaths by 2050. This comprehensive analysis underscores the potential health benefits arising from hastening the decline in smoking rates over the next thirty years.
The findings indicate that if tobacco smoking rates were to decrease gradually from current levels to 5% by 2050, life expectancy could increase by an additional year for males and 0.2 years for females. In a more ambitious scenario where smoking is wholly eradicated starting from 2023, the potential increase in life expectancy rises to 1.5 years for males and 0.4 years for females by 2050. Under both scenarios, a significant reduction in premature deaths is projected.
Tobacco smoking remains one of the principal risk factors for preventable death and illness worldwide, responsible for over one-tenth of all deaths in 2021. Despite a noticeable reduction in smoking rates over the past three decades, the pace of decline has not been uniform and has slowed in several countries. Diseases such as cancers, ischemic heart disease, and chronic obstructive pulmonary disease (COPD) continue to lead as the primary causes of smoking-related premature deaths, collectively accounting for 85% of potentially preventable years of life lost (YLLs).
Various nations have set ambitious objectives to slash smoking rates below 5% in upcoming years. Yet, a substantial opportunity remains to broaden and bolster proven policy measures and interventions to meet these targets. Professor Stein Emil Vollset from the Institute for Health Metrics and Evaluation (IHME), the study’s senior author, emphasises the critical importance of maintaining momentum in global efforts to reduce and eventually eliminate smoking. He points out that millions of premature deaths could be prevented by ending smoking.
The research utilised IHME’s Future Health Scenarios platform, which draws on data from the GBD study to provide detailed health burden forecasts for 204 countries, segmented by age and gender, from 2022 to 2050. This study is the first to comprehensively project the health impacts of smoking across all countries and causes, as well as across 365 different diseases and injuries. YLLs, a key measure of premature deaths that counts each death against the potential life expectancy at the age of death, was the primary metric used in this study.
Three future scenarios were examined: a most likely scenario based on current trends, an optimistic scenario assuming a reduction of smoking prevalence to 5%, and an ideal scenario where smoking is eliminated starting in 2023. The differences between the reference and elimination scenarios allowed researchers to assess the total future health burden that could be avoided with robust anti-smoking measures.
The study’s projections are based on past trends showing a decline in age-standardised smoking rates from 1990 to 2022, with a prediction of continued but slower decline towards 2050. Despite regional variations, the results suggest significant health improvements could be achieved by accelerating anti-smoking efforts.
However, the study acknowledges certain limitations. It estimates only the direct effects of smoking reduction on health. It does not consider the broader health benefits of reduced second-hand smoke exposure or the impacts of emerging products like e-cigarettes. Furthermore, the projections do not account for potential advances in healthcare, such as improvements in lung cancer detection and treatment, which could further influence the outcomes.
In conclusion, this comprehensive analysis highlights the critical need for sustained and intensified global efforts to curb smoking. It underscores the considerable health gains that could be achieved by meeting and exceeding current reduction targets. Such efforts are crucial for extending life expectancy and significantly reducing the burden of disease worldwide.
More information: Tobacco Forecasting Collaborators, Forecasting the effects of smoking prevalence scenarios on years of life lost and life expectancy from 2022 to 2050: a systematic analysis for the Global Burden of Disease Study 2021, The Lancet Public Health. DOI: 10.1016/S2468-2667(24)00166-X
Journal information: The Lancet Public Health Provided by The Lancet
