Longitudinal e-Cigarette and Cigarette Use Among US Youth in the PATH Study (2013–2015)

Background Evidence is accumulating that youth who try Electronic Nicotine Delivery Systems (ENDS, e-cigarettes) may go on to try cigarettes. This analysis examines the bidirectional patterns of ENDS and cigarette use among US youth over one year and uses propensity score matching (PSM) to examine frequency of ENDS use on changes in cigarette smoking. Methods Our analysis included 11 996 participants who had two waves of available data (Wave 1...