VaporBoost E-liquids
(See: Dutra LM, Glantz SA. Electronic cigarettes and conventional cigarette use: a cross-sectional study. Published online March 6, 2014. JAMA Pediatr. doi:10.1001/jamapediatrics.2013.5488.)
The problem is that in this cross-sectional study, there is no way to determine the direction of the observed relationship.
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