In the window of a hairdresser’s in a west London side-street, there is an array of brightly coloured little bottles, which the casual passer-by who doesn’t look too closely might assume had something to do with hair conditioning. References to best “juice” don’t immediately give the game away. You probably need to have come across vaping already to realise that you are looking at the paraphernalia beloved by aficionados of e-cigarettes.
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