DIY Vaporizers vs. Big Tobacco

With sales likely to top $2 billion this year, e-cigarettes have lived up to expectations that they’d revolutionize the cigarette industry. (See: “Buddy, Can I Bum a Vape?”) But already, its biggest brands—like Blu, NJoy, and Logic—are facing fierce competition from a new wave of upstarts: independent stores where consumers buy parts to build their own …