When I got my first job as an American teen, I remember being surprised by it as well. Everyone at the pharmacy I worked at did that, and some topped-up their soda by pouring in a can from the vending machine in the early afternoon. Not that I wasn't used to American soda drinking, but realizing how much of a habit it was for so many of my coworkers, was my first realization that nobody in the workforce was happy, and they were all just self-medicating with sugar and pre-diabetes.