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Background: Both tobacco smoking and atopy increase the risk of adult‐onset asthma. We studied if there are differences in the effects of smoking on the risks of atopic and non‐atopic adult‐onset asthma, and if gender modifies these effects. Methods: The Finnish Environment and Asthma Study (FEAS) includes 521 incident cases of adult‐onset asthma and 932 population‐based controls, aged 21 to 63 years, recruited from a geographically defined area of Pirkanmaa, South Finland. Asthma was defined based on symptoms and lung function measurements, atopy by IgE antibodies to common aeroallergens and smoking by the study questionnaire. Results: Altogether 212 cases were atopic, and 251 cases were non‐atopic. Regular smoking increased the risk of atopic asthma (adjusted OR 1.24, 95% CI 0.83–1.85), this effect was seen in women (aOR 1.77, 1.06–2.95) but not in men (aOR 0.75, 0.39–1.45). Among regular smokers, the amount smoked was lowest among women with atopic asthma. Recent quitting of smoking was related to increased risk of both atopic (aOR 4.91, 2.26–10.65) and non‐atopic (aOR 4.37, 1.87–10.21) asthma. Having quitted smoking over a year ago was related to increased risk of non‐atopic asthma (aOR 1.57, 1.08–2.28), mainly in men (aOR 2.03, 1.06–3.88). Conclusions: In women, rather small amounts of regular smoking increase the risk of atopic asthma. However, for non‐atopic asthma, the smoking induced risk continues for longer after quitting, especially in men. In conclusion, the effects of smoking on the risks of atopic and non‐atopic asthma differ, and gender modifies these effects. [ABSTRACT FROM AUTHOR]

Background: We hypothesised that occupational exposures differently affect subtypes of adult-onset asthma.Objective: We investigated potential relations between occupation and three subtypes of adult asthma, namely atopic asthma, non-atopic asthma and asthma-COPD overlap syndrome (ACOS).Methods: This is a population-based case-control study of incident asthma among working-age adults living in Pirkanmaa Hospital District in Southern Finland. The determinant of interest was occupation at the time of diagnosis of asthma or the job that the subject had quit due to respiratory symptoms. Asthma was divided into three mutually exclusive subtypes on the basis of any positive IgE antibody (atopic and non-atopic asthma) and presence of persistent airways obstruction in spirometry (ACOS). We applied unconditional logistic regression analysis to estimate adjusted OR (aOR), taking into account gender, age and smoking.Results: The following occupational groups showed significantly increased risk of atopic asthma: chemical industry workers (aOR 15.76, 95% CI 2.64 to 94.12), bakers and food processors (aOR 4.69, 95% CI 1.18 to 18.69), waiters (aOR 4.67, 95% CI 1.40 to 15.56) and those unemployed (aOR 3.06, 95% CI 1.52 to 6.17). The following occupations showed clearly increased risk of non-atopic asthma: metal workers (aOR 8.37, 95% CI 3.77 to 18.59) and farmers and other agricultural workers (aOR 2.36, 95% CI 1.10 to 5.06). Some occupational groups showed statistically significantly increased OR of ACOS: electrical and electronic production workers (aOR 30.6, 95% CI 6.10 to 153.35), fur and leather workers (aOR 16.41, 95% CI 1.25 to 215.85) and those retired (aOR 5.55, 95% CI 1.63 to 18.97).Conclusions: Our results show that different occupations are associated with different subtypes of adult-onset asthma. [ABSTRACT FROM AUTHOR]

Objective: The objective of this study was to investigate the potential effects of occupational exposures among fruit and vegetable market workers on the occurrence of respiratory symptoms and on the level of lung function parameters.Methods: We conducted a cross-sectional study of 140 men working as fruit and vegetable market workers (response rate 100%) and a reference group of 77 male office workers as the reference group (response rate 55%) from Shiraz, Iran. The outcomes of interest included occurrence of respiratory symptoms assessed by a standard respiratory questionnaire and lung function assessed by spirometry.Results: In Poisson regression analyses, the exposed group showed increased prevalence ratio (PR) of wheezing (adjusted PR 5.32, 95% CI 1.40 to 20.26), after controlling for confounding. Cough (PR 3.30, 95% CI 1.16 to 9.40) and wheezing (PR 9.40, 95% CI 2.28 to 38.64) showed increased PRs among vegetable distributors. Forced expiratory volume in 1 s (FEV1) and FEV1/forced vital capacity were significantly decreased among exposed workers after controlling for confounders. The absolute value of FEV1 level was reduced significantly among fruit and vegetable carters (-0.99, 95% CI -1.68 to -0.32) and vegetable (-0.51, 95% CI -0.93 to -0.10) and fruit (-0.51, 95% CI -0.86 to -0.15) distributors in comparison with the reference group in the adjusted full model.Conclusions: This study provides evidence that fruit and vegetable market workers are at an increased risk of respiratory symptoms and reduced lung function. Workplace conditions and safety training clearly need improvement, and there is a likely role for proper use of personal protective equipment. [ABSTRACT FROM AUTHOR]

Background: The steel factory work environment contains various chemical exposures that can affect indoor air quality and have impact on respiratory health of the workers., Aims: The objective of this study was to assess potential effects of occupational exposures in steel factory workers in Iran on the respiratory symptoms, occurrence and the lung function levels., Method: This was a cross-sectional study of 133 men working in a steel factory forming the exposed group and 133 male office workers forming the reference group from a steel company in Iran. The participants filled in a questionnaire and underwent spirometry. Work history was used both as dichotomous (exposed/reference) and a quantitative measure of exposure, the latter measured as duration of exposure in the specified work (in years) for the exposed group and zero for the reference group., Results: Multiple linear regression and Poisson regression were used to adjust for confounding. In Poisson regression analyses, an increased prevalence ratio (PR) of all respiratory symptoms was observed in the exposed group. Lung function parameters were significantly reduced in the exposed group ( p < 0.001). There was a dose-response relation between duration of occupational exposures and reduction in the predicted value of FEV1/FVC level (0.177, 95% CI -0.198 to -0.156) in all models., Conclusion: The results of these analyses showed that occupational exposures in steel factory work increase the prevalence of respiratory symptoms and reduce lung function. Safety training and workplace conditions were found to need improvement. In addition, use of proper personal protective equipment is recommended., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Mozaffari, Heibati, Jaakkola, Lajunen, Kalteh, Alimoradi, Nazari, Karimi and Jaakkola.)