# Second-hand smoke still burdens global health

> A GBD 2023 analysis estimates that 2.71 billion people were exposed to second-hand smoke in 2023, including 767 million children, while the absolute total has not fallen with age-standardized prevalence.

_Source: The Lancet Public Health systematic analysis for GBD 2023, verified against Crossref and PubMed/Europe PMC; Telegram post used only as the discovery lead · 2026-09-18 · 5 min read · Verified against primary sources_

Canonical: https://iyu.app/e/secondhand-smoke-global-health-burden-2023

## The 60-second version

A GBD 2023 analysis estimates that 2.71 billion people were exposed to second-hand smoke in 2023, including 767 million children.

**Key points**

- Age-standardized prevalence fell 22.2% from 1990, but the absolute number exposed stayed broadly stable worldwide.
- The model attributes 1.66 million deaths and 44.8 million DALYs to second-hand smoke in 2023.
- The figures are modeled population estimates, not individual diagnoses, but they support smoke-free environments and stronger tobacco control.

**Verdict.** The global burden remains large; policy action is justified, while the headline numbers are not personal risk estimates.

## Full explainer

> **⚠** These are modeled Global Burden of Disease estimates with uncertainty intervals. They describe population-level burden, not an individual diagnosis or a precise personal risk.


### The estimate — 2.71 billion people exposed in 2023

A The Lancet Public Health analysis used the GBD 2023 comparative-risk framework to estimate second-hand smoke exposure across 204 countries and territories. The 2023 estimate is 2.71 billion people, with a 95% uncertainty interval of 2.44 to 3.02 billion, including an estimated 767 million children aged 0–14.

- **204** — countries and territories
- **2.71B** — estimated people exposed
- **767M** — estimated exposed children
- **1990–2023** — study period


### The trend — Lower rates did not mean fewer people

The age-standardized exposure prevalence was estimated to be 22.2% lower in 2023 than in 1990. But the absolute number exposed stayed broadly stable globally and rose sharply in sub-Saharan Africa and in North Africa and the Middle East. Population growth and regional differences can offset progress in the rate.


### Health burden — Heart disease and childhood infections dominate the model

The analysis attributes an estimated 1.66 million deaths and 44.8 million disability-adjusted life-years to second-hand smoke in 2023. Ischaemic heart disease contributed the most DALYs overall; among children, lower respiratory infections were the leading contributor.

- **What was estimated:** Exposure prevalence and attributable disease burden across 204 countries and territories
- **How it was estimated:** GBD 2023 surveys, household data, statistical models and relative risks for nine outcomes
- **What it cannot tell one person:** A precise personal risk or whether a particular illness was caused by smoke

> **i** A modeled burden estimate is useful for policy, but it should not be mistaken for a count of confirmed individual cases. The paper reports uncertainty because the inputs and relative risks are not exact.


### What follows — Smoke-free environments remain the actionable layer

The study does not rank one intervention for every country, but its population-level signal supports comprehensive tobacco control and enforcement of smoke-free homes and public spaces. The groups needing particular protection include children and women in settings where exposure remains high.

> A falling rate is progress, but it is not the same as fewer exposed people.


## Primary sources

- [Telegram post 1490](https://t.me/CNSmydream/1490)
- [The Lancet Public Health paper DOI](https://doi.org/10.1016/S2468-2667(26)00168-4)
- [PubMed record 42705247](https://pubmed.ncbi.nlm.nih.gov/42705247/)
- [Europe PMC record](https://europepmc.org/article/MED/42705247)

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