Only on the "CBS This Morning" podcast, co-host Tony Dokoupil talks with CBS News contributor Dr. David Agus, an oncologist at the University of Southern California, about the recent spate of lung illness that experts are linking to e-cigarette use. Dr. Agus warns it is difficult to prove causation at this stage, but he explains how the carrier molecule used while vaping could lead to lung problems from blocked oxygen transport. They discuss how the quest to create a "safer cigarette" has produced a new kind of public health crisis and talk about the increased health risks stemming from teen vaping.

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