Over time this causes airways to narrow and blood pressure to rise, which can lead to heart attack and stroke
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He notes a telling 2013 article published in the Journal of the National Cancer Institute under the headline "No Clear Link Between Passive Smoking and Lung Cancer." The article described a large prospective study of 76,000 women that "confirmed a strong association between cigarette smoking and lung cancer but found no link between the disease and secondhand smoke." While "we don't want people to conclude that passive smoking has no effect on lung cancer," one of the researchers said, "this analysis doesn't tell us what the risk is, or even if there is a risk." An expert quoted by the journal, University of Chicago oncologist Jyoti Patel, "said the findings were not new," adding: "Passive smoking has many downstream health effectsasthma, upper respiratory infections, other pulmonary diseases, cardiovascular diseasebut only borderline increased risk of lung cancer

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When commercial air cleaners are not available or affordable, DIY air cleaners may offer some protection from smoke indoors