“…The latter products deliver considerable amount of free-base nicotine ( Nardone et al, 2019 , Keamy-Minor et al, 2019 ). JUUL’s compact size and stylish design, resembling a USB flash drive, low vapor output with minimally visible aerosol plume/cloud upon exhalation, variety of flavorings, and subtle scent, which can be passed off as perfume, are device features that make it immensely appealing to youth ( Lee et al, 2020 , Vallone et al, 2020 , Hrywna et al, 2020 , Kong et al, 2019 ). The small size, light weight, and easy to conceal JUUL can be used inconspicuously in places where smoking is prohibited; the practice is often referred to as “stealth vaping/JUULing” by teenagers in classrooms, school yards, or restrooms ( Nardone et al, 2019 , Ramamurthi et al, 2018 , McKelvey and Halpern-Felsher, 2020 ).…”