Tobacco Prevention & Cessation style devices. Vape shops sell a variety of types of refillable (and, rarely, disposable) e-cigarettes, several types of solution strengths and flavors, more complex and powerful tank systems that offer customized vaping experiences for experienced users, and sometimes other accessories (e.g. t-shirts). The vape shop business visibility is rapidly increasing. For example, a Google search for "vape shops" with "Los Angeles" revealed over 5,000 pages (accessed 12-20-2015), which increased to over 88,300 pages in 16 months (accessed 4-15-2015), to 134,000 pages one-year later (accessed 5-2-2016), and up to 168,000 pages assessed over a year after that (accessed 8-11-2017). The markup on e-cigarettes can be 200-400% (compared to 10-20% for combustible cigarettes), which may account in part for the unprecedented growth in the prevalence of such shops 2,4 , with total e-cigarette sales worldwide being approximately $2.5 billion USD in 2014, estimated to be over $3.5 billion in 2015 5 and over $50 billion dollars by 2025 6. Sales of e-cigarette products in vape shops likely are quite high, perhaps an average of $300,000 per shop 7 , although traditional measures (e.g. the Nielsen Company) have not included vape shops yet as retailers 8. Also, it is not yet possible to accurately calculate