E-cigarettes don't help people quit smoking, according to new research.
In fact, those using the devices are more likely to relapse within the next 12 months, say scientists.
First author Professor John Pierce said: "Our findings suggest individuals who quit smoking and switched to e-cigarettes or other tobacco products actually increased their risk of a relapse back to smoking over the next year by 8.5 percentage points compared to those who quit using all tobacco products.
"Quitting is the most important thing a smoker can do to improve their health, but the evidence indicates that switching to e-cigarettes made it less likely, not more likely, to stay off of cigarettes."
The team identified 13,604 smokers in the US who were tracked from 2013 to 2015 to explore changes in use of 12 tobacco products.
At the second annual follow up former smokers were compared to those who had switched to the other types.
The former group - including e-cigarette users - were 8.5 percent more likely to be back on traditional cigarettes.
Among recent former smokers who abstained from all tobacco products, 50% had been off cigarettes for at least 12 months.
They were considered to have successfully quit smoking. This compared to 41.5% of those on e-cigs or other cessation aids.
Senior author Prof Karen Messer said: "Our goal was to assess whether recent former smokers who had switched to e-cigarettes or another tobacco product were less likely to relapse to cigarette smoking compared to those who remained tobacco-free."
At the first annual follow-up, 9.4% of the participants, all established smokers, had quit.
Now considered 'former smokers', 63% remained tobacco-free - while 37% had switched to another form of tobacco use. Of these 23% used e-cigs - most of them daily.
While prone to relapse, they were also more likely to attempt to quit again and be off cigarettes for at least three months at the second follow-up.
A further follow-up survey is needed to identify if it is evidence of a pattern of chronic quitting and relapsing or part of progress toward successful quitting.
Prof Pierce said: "This is the first study to take a deep look at whether switching to a less harmful nicotine source can be maintained over time without relapsing to cigarette smoking.
"If switching to e-cigarettes was a viable way to quit cigarette smoking, then those who switched to e-cigarettes should have much lower relapse rates to cigarette smoking. We found no evidence of this."
A 2015 study found e-cigs were no better than nicotine patches or dummy devices at helping people quit smoking.
After a month of switching from tobacco the electronic devices did help smokers kick the habit.
But three to six months later, users started smoking again. The devices also caused adverse effects including dry cough, throat irritation and shortness of breath.
The analysis of 2,223 people found e-cig users were more likely to suffer serious problems such as lung inflammation and irregular heartbeat compared with using a nicotine patch.
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