Jim McManus | 26 January 2016
This morning saw a further paper , this time a longitudinal study, looking at young people in Hawai http://m.tobaccocontrol.bmj.com/content/early/2016/01/05/tobaccocontrol-2015-052705.
The paper concludes that "adolescents who use e-cigarettes are more likely to start smoking cigarettes. This result together with other findings suggests that policies restricting adolescents’ access to e-cigarettes may have a rationale from a public health standpoint. " Except, unfortunately, its methods don't justify those conclusions.