Scientists made discovery by using stem cell research. They used embryonic stem cells from mice and exposed them to cigarette smoke.
"We were surprised, and, at first, we thought maybe there's a little caveat in our research so I had to repeat the experiments over and over," said graduate researcher Sabrina Lin.
Three different light online cigarettes brands flunked the smoke test every time. Now, here's the mystery: the scientists don't know why.
Dr. Talbot explained, "Ir was a surprise to us and we'll have to do some more investigations to figure this out."