Flickr / Fried Dough

State health officials say Oklahoma's adult smoking rate is continuing to decline, dropping nearly 20 percent over the past four years to a new all-time low.

Survey results released Tuesday by the Oklahoma State Department of Health show the number of Oklahomans who smoke dropped to 21 percent in 2014, the state's lowest rate ever. The decline moved Oklahoma's ranking from 46th out of 50 states in 2013 to 40th last year.

It's become an emotional debate: Do e-cigarettes help people get off regular cigarettes or are they a new avenue for addiction?

Until now, there has been little solid evidence to back up either side. But a new study from the Centers for Disease Control and Prevention could help fill that void.

Once a smoker always a smoker, right? Not quite.

As the number of smokers drops, the remaining smokers actually smoke less and are more likely to quit, according to a study published Wednesday in the journal Tobacco Control.

"In the last 18 months, the number of vaping shops in [Oklahoma] jumped from a handful to 300, with names like Vapor Haven, the Vape Hut, Vapor World, Creative Vapor and Patriotic Vapes."