(Nam Y. Huh | AP file photo) In this April 23, 2014 file photo, a man smokes an electronic cigarette in Chicago. Teen vapers prefer Juul and mint is the #1 flavor among many of them, suggesting a shift after the company’s fruit and dessert flavors were removed from retail stores, new U.S. research suggests. The results are in a pair of studies published Tuesday, Nov. 5, 2019, including a report from the Food and Drug Administration and federal Centers for Disease Control and Prevention indicating that the U.S. teen vaping epidemic shows no signs of slowing down.