Don’t take our word for it. Here’s every fact on this site, with its evidence grade, its caveats, and a link to the source, so you can check us.
We start you on the strong ones: findings that have been replicated or come from one large, well-controlled study. Moderate and weak facts are here too, labeled for what they are. Use “Link to this fact” to share a single card.
Indoor air / Other evidence
Industry chemists note that indoor air tests for secondhand smoke also pick up cooking, cleaners, furniture polish, perfumes, hair sprays, deodorants and building materials, and one conference-room scan found non-tobacco peaks larger than the tobacco-smoke peaks.
Weak evidence: Industry authors citing an industry report; shows measurement confounding, not that ETS is harmless.
Source: Rodgman & Perfetti 2013 Industry-funded Link to this fact
Indoor air / Other evidence
Personal-use scented products (perfumes, colognes, hair treatments) release their ozone-reactive chemicals close to the breathing zone, so inhaled doses of the reaction products can be larger than room-average models predict.
Weak evidence: A single supporting chamber citation, stated as a qualitative point; no dose given here.
Source: Weschler 2006, Environmental Health Perspectives Link to this fact
Information, not medical advice. See also: myths we won’t tell you.