"First, we have no idea of what specific chemicals are contained in these products or the safety of components of e-cigs, including the batteries," said Jay.
There is some data that has suggested using e-cigarettes will make "real" smoking more appealing to youth.
There is "the gateway problem and the dual-use problem," said Jay. "Will e-cigarettes lead to decreased interest in quitting for youth and adults? We have no data that answers these basic questions."
Spangler, on the other hand, neither recommends nor discourages the use of these devices for his patients.
"I tell patients that some people have found them helpful to quit smoking, but they are not regulated for safety or purity standards by anyone," said Spangler. "I also mention that impurities such as antifreeze have been found in some samples. Then I let the patient decide."