Tobacco giant Reynolds American is buying Lorillard and acquiring Newport, a popular menthol cigarette. In a shrinking market, Newport is one of the few U.S. brands gaining market share. It is particularly popular among African-American smokers. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Vaporizer pens look like the e-cigarettes that dispense nicotine. But these devices are optimized for a potent marijuana resin with high concentrations of THC. Courtesy of Grenco Science hide caption

itoggle caption Courtesy of Grenco Science

Some employees say e-cigarettes increase their productivity and help them steer clear of tobacco. But health regulators are looking into possible risks to e-cig users — and to co-workers. iStockphoto hide caption

itoggle caption iStockphoto

Blair Roberts, a 22-year-old sales associate at Colorado E-Smokes, "vapes" with an electronic cigarette in the Aurora, Colo., store. In the absence of federal rules, Colorado is among states that considered its own age requirements for the nicotine-delivery devices. Ed Andrieski/AP hide caption

itoggle caption Ed Andrieski/AP

Electronic cigarettes are actually battery operated devices that use a heating element to atomize a flavored liquid, typically containing nicotine, so that it can be inhaled. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

Kids as young as 13 purchase e-cigarettes, or "vape pens," online, where independent sellers don't necessarily ask a buyer's age. Jenny Lei Bolario/Youth Radio hide caption

itoggle caption Jenny Lei Bolario/Youth Radio

John Hartigan, proprietor of Vapeology LA, a store selling electronic cigarettes and related items, takes a puff from an electronic cigarette in Los Angeles. Reed Saxon/AP hide caption

itoggle caption Reed Saxon/AP

The FDA is expected to determine whether e-cigarettes should be regulated like tobacco products later this month. Jim Watson/AFP/Getty Images hide caption

itoggle caption Jim Watson/AFP/Getty Images