Interesting new research from the University of Manchester finds that current smoking increases risk of hearing loss by 15.1%. Researchers were not sure whether "toxins in tobacco smoke affect hearing directly, or whether smoking-related cardiovascular disease causes microvascular changes that impact on hearing, or both." Regardless, current smokers or those exposed to passive smoking could could provide employers and insurance carriers with a potential new defense in occupational hearing loss cases if the study's results are replicated or otherwise confirmed.
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