Nicotine formula used by e cigarette maker Juul is nearly identical to the flavor and addictive profile of Marlboro cigarettes : r science What Happens Next for Vaping WIRED Sometimes when people vape for the first time they can feel quite unwell and, in some cases, they can actually be sick. This is due to the nicotine they're ingesting and is FDA warns Juul, says it marketed vapes as less harmful than regular cigarettes without agency authorization The Washington Post Juul's Harmful Side Effects Office for Science and Society McGill University