A very interesting poll this week put out by Reuters kind of confirms what a lot of us have been saying now a few months — that a small percentage of people using e-cigarettes are using them to quit smoking.

According to this poll of 5,679 people, 75 percent of the people using vaping products are continuing to smoke tobacco. Apparently a number of these people rely on e-cigs to get a nicotine charge in public places where tobacco is discouraged.

According to the poll, roughly 10 percent of adults “vape,” and about 15 percent of adults under the age of 40. That’s up dramatically from 2013, when the estimated number of vapers was 2.3 percent of Americans.

Despite that 75 percent figure, about 40 percent of vapers believe e-cigs are an effective tool for quitting cigarettes. In fact, a recent study shows that e-cigs are not especially effective in helping people quit smoking. (That doesn’t mean they don’t help anyone quit smoking, it just means that e-cigs are not some sort of “miracle cure” or for tobacco use. They might help some people, but they don’t appear to be any more effective than Nicorette, nicotine patches or simply quitting cold turkey.)