The belief among smokers that light cigarettes are less hazardous and provide a lesser health risk than traditional cigarettes is affecting industry growth
For example, one big study showed current e-cigarette users had about 2 the odds of reporting a history of depression compared with never-users
1 2 3 "2009 Wisconsin Senate Bill 181" (PDF)
Nicotine levels in electronic cigarette refill solutions: a comparative analysis of products from the U.S., Korea, and Poland
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Then, as Doll later told the BBC, we asked them every question we could think of. These questions covered their medical and family histories, their jobs, their hobbies, where they lived, what they ate, and any other factor that might possibly be related to lung cancer