Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Portrait Of A Vaper Girl In Profile. A Girl With An Electronic Cigarette In A Cloud Of Smoke. A Woman With An E cigarette On A Dark Background With Space For Text. A Full article: A review of e cigarettes and their effects on DNA methylation in human studies Nicotine formula used by e cigarette maker Juul is nearly identical to the flavor and addictive profile of Marlboro cigarettes : r science