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Our results demonstrate that overall electronic cigarettes seem to be less harmful than regular cigarettes, but their elevated content of toxic metals such as nickel and chromium do raise concerns, said Constantinos Sioutas, professor at the USC Viterbi School of Engineering and corresponding author of the study, which was published online on Aug

Scientists calculate how much pollution you breathe in and compare it to smoking cigarettes

This infographic, from The Campaign for Tobacco-Free Kids, lays out exactly how cigarettes have changed in the last 50 years

Finally, fluctuation of the occurrence of phantom smells is likely to worsen the deleterious effect of unexpectedness, explaining why fluctuating OD is a significant predictor of negativity of phantosmia

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