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In individuals with asthma and chronic obstructive pulmonary disease (COPD), acute, short-term secondhand smoke (SHS) exposure has been shown to modify spirometric indices and is a known hazard. However, the results of an intervention trial (ClinicalTrials.gov Identifier: NCT03074734) suggest that this effect may only be significant in asthma and not COPD. Results of the analysis were published in the Journal of Asthma.
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