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Background: The effects of cigarette smoking and alcohol consumption on the risk of alopecia areata (AA) are unclear. Objective: The aim was to examine the association of cigarette smoking and alcohol consumption with AA. Methods: We collected participants from four rounds (2001, 2005, 2009, and 2013) of the Taiwan National Health Interview Survey. Incident AA cases were identified from the National Health Insurance database. Results: Of the 60,055 participants, 154 developed AA during the 647,902 person-years of follow-up. After controlling for confounders, current smokers had a higher risk of incident AA than never smokers [adjusted hazard ratio (aHR) 1.88; 95% confidence interval (CI) 1.22–2.88]. There was a trend toward an increased risk of AA with increasing numbers of years of smoking and cumulative pack-years of smoking among current smokers. The aHRs (95% CIs) of current smokers of > 5 and ≤ 15 cigarettes per day, > 10 and ≤ 20 years of smoking, ≤ 10, and > 10 and ≤ 20 pack-years of smoking were 2.03 (1.17–3.51), 2.25 (1.21–4.18), 1.86 (1.12–3.09), and 2.04 (1.04–4.01), respectively. Conversely, social and regular drinkers had significantly lower risks of AA than never drinkers [aHRs (95% CIs) 0.65 (0.43–0.98) and 0.49 (0.26–0.93), respectively]. Conclusion: Current smokers had an increased risk of developing AA, while alcohol consumption was associated with a decreased risk of AA. [ABSTRACT FROM AUTHOR]

Background: There is evidence suggesting an association between bullous pemphigoid (BP) and a range of neurological diseases. Whether neurological cancer is a risk factor for BP remains unknown. Objective: The aim of the study was to investigate the risk of subsequent BP among patients with neurological cancer. Methods: This nationwide population-based cohort study was based on data obtained from the Taiwan National Health Insurance Research Database between 2000 and 2012. A total of 8313 patients with neurological cancer and 33,252 age-, sex-, and index-date-matched controls were recruited. The hazard ratio (HR) for subsequent BP in patients with neurological cancer was analyzed using a Cox model and Fine-Gray competing risk model, with mortality as the competing event. Results: The incidence rates of BP per 100,000 person-years were 37.2 for patients with neurological cancer and 6.8 for controls. The crude incidence rate ratio was 5.49 (95% confidence interval [CI] 2.18–13.30). The mean time to occurrence of BP was 4.48 ± 3.40 years for patients with neurological cancer. Neurological cancer (HR 9.65, 95% CI 3.76–24.77 for the Cox model; HR 2.41, 95% CI 1.14–5.14 for the competing risk model), age per year (HR 1.10, 95% CI 1.05–1.15 for the Cox model; HR 1.06, 95% CI 1.02–1.09 for the competing risk model), and dementia (HR 6.31, 95% CI 2.49–15.99 for the Cox model; HR 7.50, 95% CI 2.84–19.85 for the competing risk model) significantly increased the risk of BP. Conclusions: Neurological cancer increased the risk for subsequent BP by 2.4-fold, with a relatively short gap of 4.5 years. [ABSTRACT FROM AUTHOR]