Here is a London Cafe Dedicated to Smokers of E-Cigarettes
Ah. The humble e-cigarette. These vaporizer-based "fake" cigarettes are usually used by heavy smokers as a stopgap measure before they quit. However, lots of people just like them and smoke them in lieu of regular cigs, not as any sort of first step toward a smoke-free lifestyle. For these latter folk, boy does London have a cafe for you.
Vape Lab, located in trendy East London, is a coffee shop that also doubles as an e-cigarette lover's dream. They sell dozens of e-liquid flavors, ranging from absinthe and Cuban tobacco to bubblegum and custard. Also, you don't even have to own your own vaporizing device. They'll rent one to you for the evening.
Unfortunately, the cafe's policy on actual cigarettes is a bit vague. Hopefully there won't be some kind of tobacco-based turf war.