But what is the clinical meaning of this effect? In order to find that out, one needs to conduct studies with longer-term end points.

The study finds that e-cigarette use is associated with smoking status. In addition, e-cigarette use is associated with heavier smoking and with fewer periods of smoking abstinence.

The communications director for another national anti-smoking group added: "This just goes to show that the tobacco companies have not changed. They will go to any extent to keep America's children smoking, even paying university scientists to do their dirty work for them."

Instead of worrying about banning electronic cigarettes in every park, sidewalk, and beach in the country, anti-smoking groups should get back to the business of trying to reduce smoking: that means focusing on promoting smoke-free workplaces in the states that still don't offer such protection and embracing e-cigarettes as a smoking cessation and harm reduction strategy.

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