From iO9, and you can read the article at the link:
True to your experience? Most professors I know drink coffee or tea… so I’m not surprised to see them on the list. What about politicians?
Among those polled, scientists and lab techs were found to be the heaviest coffee drinkers in the country. Anyone who works, or has worked, in science will likely find this result unsurprising. Science, after all, is a 24-hour job. Experiments often run on timelines that are in every way at odds with the circadian rhythms of a normal human being — or any other creature, for that matter. Many scientists work under crushing pressure to publish results before competing labs or research groups. Limited funding requires researchers to put in countless hours writing grant proposals when they could be doing science. (It’s not that they’re writing grants instead of doing science, by the way. They’re writing grants and doing science.)