A survey has revealed that nurses consume the most coffee closely followed by the physicians.
The study, which was conducted by Career Builder and Dunkin' Donuts wanted on more than 3,600 workers, found that more than two in five Americans say they are less productive without coffee.
40 percent of those surveyed between the ages of 18-24 admit they can't concentrate without coffee.
The study also found that 37 percent of American workers drink two or more cups of coffee during their workday, ABC News reported.
The 12 heaviest coffee drinkers are:
3. Hotel workers
5. Financial/Insurance sales representatives
6. Food preparers
9. Marketing/Public Relations professionals
11. Machine operators
12. Government workers