Viewpoints: Is the jury still out on e cigarettes? NZ Drug Foundation 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 Vaping Could Make You 40 Percent More Likely to Get Respiratory Disease The Brink Boston University FDA hazy on e cigarettes' safety CNN.com