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8.       Hammond, D., Reid, J. L., Cole, A. G., & Leatherdale, S. T. (2017). Electronic cigarette use and smoking initiation among youth: a longitudinal cohort study. CMAJ189(43), E1328-E1336. https://doi.org/10.1503/cmaj.161002

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10.  England, L.J., Bunnell, R.E., Pechacek, T.F., Tong, V.T. and McAfee, T.A. (2015). Nicotine and the developing human: A neglected element in the electronic cigarette debate. American Journal of Preventive Medicine, 49(2), pp.286-293.

11.  US Department of Health and Human Services. (2016). E-cigarette use among youth and young adults: A report of the Surgeon General.