The FTC has started issuing reports on e-cigarette marketing expenditures, and it has released data from through 2020 (see our summary of that data here: FTC E-Cigarette Report Shows Importance of Flavors, Price Discounts)
Drinking soda isn't conducive to a healthy diet, so dropping a soda habit altogether is the healthier option if feasible
When people travel to Great Britain (England, Wales or Scotland) from outside the UK, travel personal allowances mean they can bring in a certain amount of goods without paying tax or duty
With this in mind, PG and VG do contain chemical energy, which food labels call calories, which is why you can technically calculate kcal per mL of e-liquid
However, the city does not have any guidelines in place for anyone who wants to open an e-cigarette store