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It will be many years before long-term studies following the health of e-cigarette users are able to help us understand if vaping causes long-term health problems or not, critical information needed to determine if they are, in fact, a viable alternative to cigarettes

Scientific American

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Traditional physical gear selectors are disappearing

A recent Johns Hopkins University report in the journal Chemical Research in Toxicology noted e-cigarettes brands contain thousands of unknown chemicals and substances, often not disclosed by the manufacturers, and that the effects on the body of these chemicals remain to be seen.[10] One of the researchers said: I have a problem with how vaping is being marketed as more healthy than smoking cigarettes