Survey: 1/3 of U.S. workers say they need coffee

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A new survey from Dunkin Donuts finds that nearly one-third of American workers say they need a cup of coffee to get through the workday.

As for the workers most dependent on that caffeine -- nurses are at the top of the list -- followed by doctors and hotel workers.

By age group, it's young people -- ages 18-to-34 who most say they can't make it through the day without drinking coffee.

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