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A new diagnosis of asthma or COPD is linked to smoking cessation – the Tromsø study

Authors Danielsen SE, Løchen ML, Medbø A, Vold ML, Melbye H

Received 9 March 2016

Accepted for publication 16 April 2016

Published 30 June 2016 Volume 2016:11(1) Pages 1453—1458

DOI https://doi.org/10.2147/COPD.S108046

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Colin Mak

Peer reviewer comments 5

Editor who approved publication: Dr Richard Russell

Signe Elise Danielsen,1 Maja-Lisa Løchen,1 Astri Medbø,1 Monica Linea Vold,2 Hasse Melbye3

1Department of Community Medicine, The Arctic University of Norway, 2Department of Respiratory Medicine, University Hospital of North Norway, 3General Practice Research Unit, Department of Community Medicine, UiT The Arctic University of Norway, Tromsø, Norway

Background: Patients with COPD have had a lower tendency to quit smoking compared to patients with coronary heart disease (CHD). We wanted to investigate if this is still true in a Norwegian population.
Methods: Our data came from the fifth and sixth Tromsø surveys, which took place in 2001–2002 and 2007–2008. The predictors of smoking cessation were evaluated in a cohort of 4,497 participants who had stated their smoking status in both surveys.
Results: Of the 4,497 subjects in the cohort, 1,150 (25.6%) reported daily smoking in Tromsø 5. In Tromsø 6, 428 had quit (37.2%). A new diagnosis of obstructive lung disease (asthma or COPD) and CHD were both associated with increased quitting rates, 50.6% (P=0.01) and 52.1% (P=0.02), respectively. In multivariable logistic regression analysis with smoking cessation as outcome, the odds ratios (ORs) of a new diagnosis of obstructive lung disease and of CHD were 1.7 (1.1–2.7) and 1.7 (1.0–2.9), respectively. Male sex had an OR of 1.4 (1.1–1.8) compared to women in the multivariable model, whereas the ORs of an educational length of 13–16 years and ≥17 years compared to shorter education were 1.6 (1.1–2.2) and 2.5 (1.5–4.1), respectively.
Conclusion: The general trend of smoking cessation in the population was confirmed. Increased rates of smoking cessation were associated with a new diagnosis of heart or lung disease, and obstructive lung disease was just as strongly linked to smoking cessation as was CHD. This should encourage the pursuit of early diagnosis of COPD.

Keywords: smoking cessation, cohort study, COPD, asthma, coronary heart disease

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