"For an ideal study, from a purely scientific perspective, we'd give everybody an e-cigarette, follow them for a few years and see if they start smoking, then rewind the clock and don't give them an e-cigarette," said study author Brittney Keller-Hamilton from Ohio State University in the US.
The study, published in the journal JAMA Network Open, provides some of the very first longitudinal evidence on the harms associated with e-cigarette products.
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