A group of 39 state attorneys general on Tuesday announced an investigation into Juul Labs Inc's marketing practices, adding to mounting legal and regulatory problems for the e-cigarette maker over its role in the nation's youth vaping epidemic.

FILE PHOTO: Juul vape cartridges are pictured for sale at a shop in Atlanta, Georgia, U.S., September 26, 2019. Picture taken September 26, 2019. REUTERS/Elijah Nouvelage/File Photo