What to Know About Electronic Cigarettes (E Cigarettes) Researchers find e cigarettes help reduce smoking, presence of carcinogen The Commonwealth Times E cigarettes Stress Lungs, Impair Protein Function News Release PNNL Older users of e cigarettes at greater risk of respiratory illness, study suggests CUNY Graduate School of Public Health & Health Policy E cigarettes have 10 times more carcinogens, Japanese researchers say South China Morning Post