3. "E-cigarettes are likely to be gateway devices for nicotine addiction among youth, opening up a whole new market for tobacco."

Why?

In other words, despite acknowledging that they cannot tell from their study whether e-cigarette use precedes smoking or whether smoking precedes e-cigarette use, they nonetheless draw the conclusion that e-cigarette use precedes smoking.

LAST：2013 top supplier for G-hit e cigarette pcc OEM on G-hit is accepted |NEXT：Kamry 2014 Newest mini e cigarette kamry 1.0, ego e cig kamry 1.0, kamry 1.0 vape