USA Today reports that the federal Centers for Disease Control and Prevention has uncovered more evidence showing that people who roast, grind and package coffee at commercial plants or cafes to "pay close attention to their health." The researchers found that workers had wheezing in their chests at four times the rate expected when compared to a similar demographic of the U.S. population. The warning applies to all production workers involved with tasks such as roasting, opening bins and scooping beans, grinding, weighing and packaging coffee.