FDA warns retailers against illegal sale of e cigarettes to children PBS News Some E Cigarette Flavors May Be More Harmful Than Others The Atlantic Teens who use flavored e cigarettes more likely to start smoking Harvard Health E Cigarettes, Vaping & Lung Health Pulmonary & Respiratory Care Loma Linda University Health The dangers of electronic cigarettes Article The United States Army Viewpoints: Is the jury still out on e cigarettes? NZ Drug Foundation