Meta-analysis confirms health impact of protective measures against exposure to tobacco smoke

A meta-analysis of 144 studies on tobacco control policies examined their impact on population health. It concluded that policies to protect against exposure to tobacco smoke significantly reduced morbidity and mortality.

Twelve meta-analyses and comprehensive literature reviews have already questioned the link between tobacco control measures and their impact on population health. However, these generally focused on one or a few tobacco control measures. A team of Japanese, Bangladeshi, and Cameroonian researchers conducted a more comprehensive meta-analysis to estimate the impact of all these anti-smoking policies on health issues.

A clearly positive role for health of protection against tobacco smoke

The researchers' meta-analysis was based on 144 studies, whether observational or quasi-experimental.[1]. All types of tobacco control policies were included, whether a single measure or a comprehensive package of measures. The scope of health impacts was also very broad, including smoking-related symptoms and diseases.

Among the 60 studies that relied on quantitative information and proved to be the most usable, a focus was placed on the most numerous studies, those focused on the effects on population health of policies protecting against exposure to tobacco smoke. It emerged that these measures led to a significant reduction in illnesses and mortality from cardiovascular and respiratory diseases, adverse effects on births, as well as the number of hospitalizations, with the reduced passive exposure of individuals to tobacco smoke explaining these positive effects on health.

An invitation to generalize smoke-free spaces

Regarding other tobacco control measures, the results were difficult to interpret given the heterogeneity and therefore lack of comparability of the studies. Other meta-analyses have already demonstrated the reduction in smoking prevalence due to tax increases, the introduction of health warnings, bans on tobacco advertising, and restrictions on tobacco marketing.

Ultimately, the authors conclude that policies to protect against exposure to tobacco smoke have been able to formally demonstrate a significant positive impact on the health of populations. They call for the widespread introduction of smoke-free enclosed spaces and smoke-free outdoor spaces. This type of measure is one of the six axes of the MPOWER program, promoted by the World Health Organization (WHO) and designed to reduce smoking prevalence[2].

Keywords: anti-smoking policies, meta-analysis, smoking ban, tax policy.

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[1] Akter S, Islam MR, Rahman MM, et al. Evaluation of Population-Level Tobacco Control Interventions and Health Outcomes: A Systematic Review and Meta-Analysis. JAMA Network Open. 2023;6(7):e2322341. doi:10.1001/jamanetworkopen.2023.22341

[2] WHO, WHO report on the global tobacco epidemic, 2023, Protect people from tobacco smoke, 2023, report, 248 p.