The authors admit this in the paper. They write: "This is a cross-sectional study, which only allows us to identify associations, not causal relationships."

The full effect of using electronic cigarettes on people’s health has yet to be established as e-cigs are a relatively new device and long term effect studies simply do not yet exist. Though there is only limited research at this time, the studies that do exist primarily seem to agree that the electronic method of delivering tobacco to your system is significantly safer than the traditional method of combustible smoking, which exposes the user to noxious smoke and tar. The AHA policy statement read: “To date, relatively little research has been conducted on the human health effects of e-cigarettes.” They go on to cite a study by the American Journal of Preventative Medicine, in which they found that, “no serious adverse effects have been reported in clinical trials with less than 6 months of use compared with nicotine patches.” Users who are trying to quit smoking and using nicotine replacement often report having more success with e-cigarettes as a cessation method for a variety of reasons. Not only do vapor cigarettes deliver the nicotine in a safer way, they also allow the user to have an enjoyable experience, one that is similar to traditional smoking, which many smokers agree is often just as much of a part of their addiction as the nicotine itself.

Instead, these advocates argued that surveys are the best way to study the potential benefits of e-cigarettes. Surveys measure the real-life situation of how e-cigarettes and vapor products are actually used.

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