Construction of electronic cigarettes Wikipedia E Cigarettes Went Unchecked in 10 Years of Federal Inaction The New York Times How Electronic Cigarettes Work HowStuffWorks Teens say they don't vape, they 'Juul.' That makes the activity hard to track Los Angeles Times Vaping's Hidden Dangers: New Study Links E Cigarettes to DNA Changes Severe restrictions to be placed on the sale of most e cigarettes: FDA pennlive.com