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Effects of short-term smoking on lung function and airway hyper-responsiveness in young patients with untreated intermittent adult-onset asthma: retrospective cross-sectional study at a primary–tertiary care hospital in Japan
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- Published on: 12 June 2019
- Published on: 12 June 2019Observation at the right time
Dear editor,
We read with great interest the article by Kentaro Watai et al. They describe Short-term active smoking in early adulthood may be associated with decreased lung function and AHR, even in patients with intermittent adult-onset asthma. However we would like to make one comment.
There was a period from the first visits to a histamine airway challenge test. If never smokers were receiving treatment by the time of the test, ther AHR would be lower than expected.[1]This information bias will weaken their conclusion.
1. Haahtela T, Jarvinen M, Kava T, et al : Efects of reducing or discontinuing inhaled budesonide in patients with mild asthma. N Engl J Med 1994 ; 331 : 700―705.
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