wqow. com /story/22960738/2013/07/29/the-electronic-cigarette-ignites-debate

"The FDA has not evaluated it for the content of nicotine or for other dangerous drugs," says Mayo Clinic Health System Nurse Practitioner, Kim Edson.
"USP grade liquid nicotine, kosher certified natural and artificial flavors," says Hartkemeyer.
Much shorter than the list of ingredients in a cigarette, but still not approved by doctors.