Secondhand Cigarette Smoke

Living or working around indoor smoking.

19Severe burden · out of 100

Cleaner swapA strictly smoke-free indoor environment

How this score is built

100Start
54Chemical hazard 10 × 4.6−46
26.8Everyday exposure 8 × 3.4−27.2
19Persistence 3 × 2.6−7.8
SevereThe band19 sits in 1–19.

What each input rests on

The three ratings behind the score, and the studies each rests on
Input	Rating	Evidence
Chemical hazard	10/10	Using data from 192 countries, second-hand smoke was estimated to have caused 603,000 deaths in 2004, about 1.0% of worldwide mortality, including 379,000 from ischaemic heart disease and 21,400 from lung cancer. Worldwide burden of disease from exposure to second-hand smoke: a retrospective analysis of data from 192 countries · Lancet 2011 DOI 10.1016/S0140-6736(10)61388-8 · PMID 21112082 · Abstract · read 2026-10-06
Everyday exposure	8/10	unsourced input
Persistence	3/10	unsourced input

Ratings are editorial. A study listed here supports the rating; it did not compute it. How the index is built

What this means for you

The chemical-hazard rating is what drives the score down. A confirmed human carcinogen with no safe level of exposure. Keeping all indoor spaces smoke-free is non-negotiable for detox load.

Evidence strength: strong

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Lower-exposure choices

HEPA-Filtered Indoor AirMinimal · Air

All 13 air entries, highest burden first →