According to a new study, e-cigarettes are not as useful as a smoking cessation device as is currently advertised. 

Researchers at the University of California, San Francisco say studies on e-cigarettes' effectiveness of cessation have been unconvincing.

Tobacco control advocates say the concern over the increase in e-cigarette use is that they are not FDA-regulated and there is no way of knowing if they are safe for long-term use.

"We don't know all the chemicals or what the chemicals are in electronic cigarettes yet," said Pat Folan, of the Center for Tobacco Control at North Shore LIJ. "We don't have the studies to show that they're safe, safer or harmful."

Despite the research, smokers at Long Island Vapor Emporium in Franklin Square told News 12 that vaporizing devices have helped them with their cigarette habits. 

"[E-cigarettes] helps satisfy the physical addiction I had to nicotine and the psychological addiction I had to doing something with my hands and my mouth," says Anthony Napolitano, owner of LIVE.