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can cigarette smoke go through walls Secondhand travels doorways, cracks, ventilation, and plumbing, causing disease and early death in people who do not smoke. Only 100% smokefree indoor air fully protects from secondhand does cigarette smoke travel through
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But their calculations are based on a 70% extraction rate

Lung cancer trends in young adults: an early indicator of progress in tobacco control (United States)
Vaping can also act quickly, but many patients find it easier to meter

Tobacco companies are attempting to undermine government regulation by using harm reduction claims as a strategy for reframing the industry as part of the solution instead of part of the problem, according to commentary in Tobacco Control
