U.S. Vape Regulations: PMTA Registration and State Compliance E cigarette specialty retailers: Data to assess the association between retail environment and student e cigarette use ScienceDirect Doctors fail to help teens quit smoking, study finds GMA School proximity and census tract correlates of e cigarette specialty retail outlets (vape shops) in central Texas ScienceDirect Should America ban flavoured e cigarettes? Analysis of state portrayals of the risks of e cigarette use and the cause of the EVALI outbreak Harm Reduction Journal Springer Nature Link