E-cigarette sales boom despite health concerns and crackdowns.

E-cigarette sales have surged nearly 50% over the past three years, with non-tobacco flavored e-cigarettes driving the increase, according to a CDC analysis. However, calls to poison control centers over young children ingesting liquid or inhaling vapor from e-cigarettes have doubled from several years ago, according to a new report from the FDA. The agency has issued dozens of warning letters as part of a "nationwide retailer inspection blitz" to crack down on illegal sales of brands like Elf Bar. Some state and local governments have also tried to impose restrictions on flavored e-cigarette sales.