Cigarette smoking and hearing loss - The epidemiology of hearing loss study

Context.-Clinical studies have suggested that cigarette smoking may be associated with hearing loss, a common condition affecting older adults. Objective.-To evaluate the association between smoking and hearing loss. Design.-Population-based, cross-sectional study. Setting.-Community of Beaver Dam, Wis. Participants.-Adults aged 48 to 92 years. Of 4541 eligible subjects, 3753 (83%) participated in the hearing study. Main Outcome Measures.-The examination included otoscopy, screening tympanometry, and pure-tone air-conduction and bone-conduction audiometry, Smoking history was ascertained by self-report. Hearing loss was defined as a pure-tone average (0.5, 1, 2, and 4 kHz) greater than 25-dB hearing level in the worse ear. Results.-After adjusting for other factors, current smokers were 1.69 times as likely to have a hearing loss as nonsmokers (95% confidence interval, 1.31-2.17), This relationship remained for those without a history of occupational noise exposure and in analyses excluding those with non-age-related hearing loss. There was weak evidence of a dose-response effect. Nonsmoking participants who lived with a smoker were more likely to have a hearing loss than those who were not exposed to a household member who smoked (odds ratio, 1.94; 95% confidence interval, 1.01-3.74). Conclusions.-These data suggest that environmental exposures may play a role in age-related hearing loss. If longitudinal studies confirm these findings, modification of smoking habits may prevent or delay age-related declines in hearing sensitivity.