Move over tobacco: U.S. teens now prefer e cigarettes, study finds Los Angeles Times Tampa professor warns e cigarettes can harm young people's brains wtsp.com Study Finds Minnesota's Taxes on E Cigarettes Led to an Increase in Smoking of Traditional Cigarettes E cigarettes Stress Lungs, Impair Protein Function News Release PNNL Southern Chinese city bans e cigarettes in public places Chinadaily.com.cn