Christopher Snowdon reported the details of the story back in February. He wrote:

Dr. Foulds and colleagues developed a 10-question scale to assess nicotine dependence and administered it to a sample of 2,368 current electronic cigarette users. Subjects were asked to fill out the scale to assess the level of their addiction while smoking, and then again to assess the level of their current addiction using electronic cigarettes.

Trueba et al. also found that higher depressive mood was associated with greater reductions in exhaled nitric oxide.

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