tobacco smoke air pollution in smokers' homes can reach outdoor levels in worst cities Why focus on exposure to

Why focus on exposure to thirdhand tobacco smoke and not exposure to auto exhaust or industrial pollution? Thirdhand Smoke Resource Center Exposure to polluted air is like smoking a pack a day, study says PIX11 HypoallergenicAir CAUSE OF INDOOR AIR POLLUTION Tobacco Smoke from the Surroundings Tobacco smoke from the surroundings: mixture of smoke from a cigarette, pipe or cigar burning end, and even How many cigarettes you're indirectly smoking Secondhand Tobacco Smoke and Indoor Air Quality US EPA

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