There are a few studies, and here are a couple of them: There was an online survey done, and it was discovered that about 70 percent of those who used e-cigs ended up quitting the tobacco and they noticed they were less additive
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This does a nice job of redistributing clean air in the room but may make the unit less than perfect to sit right next to
p13-13 Volume 48 - Issue 3 - January 2009: Boxwood Bookshelf
Almost any data we have comparing smokers with non-smokers is focused on people who smoke regularly
Additionally, there is no environmental impact associated with vaping since it produces only water vapor and not secondhand smoke