If you work in a noisy enviroment .?

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If you work in a noisy environment which happens to be 87 decibels. How long does your ears get before the noise starts to do damage to them. And also what happens if you smoke for example and the time limit for 87 decibles is 2 hours and you have a fag for say 5 mins every hour. Does that mean your ears will be safe? cheers

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