They sell something that doesn't work so well online or at a supermarket. Ditto barbers, phone repair, or whatever racially-coded tabloid bugbear de jour. They work in a town centre, everything else can't beat the prices set by larger (often American-owned) businesses.

You can buy a vape online, but as a smoker, you don't want to wait a day when you've run out. Also as a smoker, I don't get why they're not regulated like tobacco. They shouldn't be sold alongside sweets, and should otherwise be treated like cigs (e.g. on packaging, licensing, advertising etc.). Seems very low-hanging legislative fruit.