Original Articles: Asthma, Lower Airway Diseases
Cigarette smoking and the adult onset of bronchial asthma in Japanese men and women

https://doi.org/10.1016/S1081-1206(10)60333-XGet rights and content

Background

Although smoking is a well-known risk factor for the onset of airway diseases, the associations between smoking and asthma are inconsistent.

Objective

To examine the relationship of smoking in adulthood with the occurrence of asthma in Japanese individuals.

Methods

A total of 6,674 men and 8,301 women from a population-based cohort in Takayama, Japan, participated in this prospective study. Information on smoking was collected via a baseline questionnaire in 1992. In 2002, development of asthma and the time of physician diagnosis were reported.

Results

During 10-year follow-up, 105 men and 92 women reported the onset of physician-diagnosed asthma. Among men, compared with never smokers, current smokers at baseline had a significantly increased risk of asthma after adjustment for covariates (hazard ratio [HR], 2.79; 95% confidence interval [CI], 1.18–6.55), whereas women with a current or former history of smoking were at an increased but not significant risk of asthma (HR, 1.18; 95% CI, 0.58–2.38). An approximately 2- to 5-fold increased risk of asthma was observed in men who smoked for more than 30 years or more than 21 cigarettes daily, with a nonsignificant linear trend, but there was no dose-response relationship in current-smoking women. Ever-smoking women with husbands who were ever smokers had a higher risk of asthma (HR, 2.02; 95% CI, 0.72–5.65) than never-smoking women with husbands who had never smoked either.

Conclusion

These data suggest that smoking increases the risk of asthma onset in men.

Section snippets

INTRODUCTION

Smoking has been implicated as an etiological factor in airway diseases such as nasopharyngeal and lung cancers, chronic obstructive lung disease (COPD), and asthma.1, 2 One effect of smoking is alteration of the inflammatory response through the immunologic impact in the airways. The response in smokers is different from that in nonsmokers, which is that eosinophil numbers are reduced, whereas neutrophil numbers are raised in sputum from smokers. Furthermore, smoking is known to cause acute

Study Design and Population

Participants were from the Takayama Study, which is a population-based cohort study of men and women 35 years and older who resided in Takayama, Gifu. At baseline (1992), a self-administered questionnaire was given to 36,990 men and women. Participants were asked about their diet, sociodemographic status, anthropometric characteristics, past and current smoking status, quantity of regular physical activity, and medical history. The amount of regular physical activity was evaluated weekly

RESULTS

The characteristics of the population at the beginning of the study are given in Table 1. Participants with either current or former smoking experience at baseline tended to have a lower BMI and to consume more alcohol than never smokers. In women, participants with smoking experience tended to be younger and were less likely to be married than never smokers. Education of 15 years or more was nonsignificantly associated with smoking in men and women. In men, the metabolic equivalent score,

DISCUSSION

In this prospective, community-based study, we found that current smoking was significantly associated with an increased risk of asthma onset in men. Male former smokers had an increased risk of asthma, although this association was not statistically significant. An approximately 3- to 5-fold increased risk was observed in men who had smoked for more than 30 years or more than 20 cigarettes daily. These results indicate that active smoking increases the risk of asthma in men.

Female ever smokers

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    Disclosures: Authors have nothing to disclose.

    Funding Sources: This study was supported in part by a grant from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.

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