How big is vaping?

E-cigarettes swept onto the market about a decade ago. They're now a $2.6 billion industry in the United States, and roughly 20, 000 vape and smoke shops have sprung up across the country in the past few years. There is also a thriving black market for vape pods. A survey last year found that 10.8 million American adults used e-cigarettes and that more than half were also smoking cigarettes.