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The study, conducted by researchers from the Columbia University’s Mailman School of Public Health, used computed tomography (CT) scans to examine lung changes in 1,781 healthy non-smoking adults from six communities in the United States. About half of the participants had at least one regular smoker in their household during childhood. Those reporting childhood exposure to tobacco smoke were average age 61, primarily non-Hispanic white, and less likely to have been born outside the United States. An analysis of the scans showed that, compared to participants who did not live with regular smokers during childhood, those who were exposed to ETS had more emphysema-like lung changes. The changes were worse for adults whose households had two smokers, compared to one, compared to no one in the home who smoked. Those exposed to ETS were also at an increased risk of developing childhood asthma.
“We were able to detect a difference on CT scans between the lungs of participants who lived with a smoker as a child and those who did not,” said Dr. Gina Lovasi, assistant professor of epidemiology at Mailman. “Some known harmful effects of tobacco smoke are short term, and this new research suggests that effects of tobacco smoke on the lungs may also persist for decades.”
None of the information in the study could determine if lung damage occurs during pregnancy from expectant mothers who smoke, but the researchers said “the association between childhood ETS and early emphysema among participants whose mothers did not smoke suggests that the effect we are detecting is for smoke exposure in the home during childhood rather than in utero exposure alone.”
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