Thirdhand smoke is as dangerous as active smoking, according to anti-smoking researchers at the University of California, Riverside.

In the above analyses, the authors controlled for level of nicotine dependence.

2. The regulations require pre-approval (or substantial equivalence determinations) for all new electronic cigarette products.

According to the interview transcript, Dr. Frieden told the public: "I certainly see the theory that they could be helpful and I've heard some anecdotes about individuals who say they have helped them quit. But much more importantly is the actuality that right now we're getting millions of kids experimenting with or using regularly e-cigarettes. We're getting smokers who are perhaps using them not to quit but to keep smoking regular cigarettes. We're seeing large numbers of ex-smokers going back to nicotine products for the first time in years using e-cigarettes. We're seeing the re-glamorization of smoking as an act. And we're also seeing potential exposure of nonsmokers, including pregnant women, to the nicotine in e-cigarette products. So I see theoretical potential benefits but definite harms occurring."

Once again, I was attacked by my colleagues, including two co-authors of the 2014 Surgeon General's report, for having the nerve to suggest that lifelong smokers of filtered cigarettes may have slightly lower lung cancer risk than lifetime smokers of non-filtered cigarettes.

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