Same thing as fog machines in the club, Proplyne glycol(sp?) It may seem funny to non smokers, but I smoked for 15 years and the e_cig got me to quit smoking inhaling carbon monoxide, and 1000 other chemicals.
People that did heroin,crack and meth have quit those drugs and couldn't quit tobbacco, its the hardest thing to quit. So havve your laughs, but it works if you want to.
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