Juul Shake-Up: C.E.O. Steps Down

The chief executive of Juul Labs, the dominant e-cigarette company that has been the target of public and regulatory outrage over the soaring use of teenage vaping, stepped down on Wednesday. The executive, Kevin Burns, will be replaced by K.C. Crosthwaite, an executive from Altria, the major tobacco company that owns a 35 percent stake…