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Second, because the data regarding personal history of smoking in the KoGES were collected only in the beginning of the study and possible changes were not followed up, individuals initially identified as smokers continued to be classified as such, even if they quit smoking afterward

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Possible biomarkers The researchers conclude that exposure to second-hand smoke was associated with changes in protein expression that are linked to the response to toxic elements in the blood, systemic inflammation/autoimmunity, and blood vessel diseases. Long-term follow-up to detect changes over time would provide more answers about how second-hand smoke affects health in the long term