SAN ANTONIO -- An increasing amount of children have been checking into the Texas Poison Center for electronic-cigarette poisoning.

According to the center, 52 percent of the calls for e-cigarette exposure involved children under the age of five, from 2009 to 2013.

E-cigarettes are battery-powered, and the liquid mixture inside the device contains nicotine.

There is more research left to be done on the health effects of the electronic product.

As e-cigarettes gain in popularity -- as an alternative to traditional smokes -- poisoning cases are increasing statewide, Doctor Miguel Fernandez of the Texas Poison Center said.

Also, with no state or federal regulations, it's up to a store's discretion to sell e-cigarettes to minors.

According to a National Youth Tobacco Survey, e-cigarette use nearly doubled among high school students, from 2011 to 2012.

The University of Texas Health Science Center is in the process of conducting research to determine what the true health consequences of e-cigarette use might be.

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