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The only particulate that I've notice in the ""vapor"" are from the coatings on the heating element or other parts of the hardware (using Aspire DBC) crumbling and having tiny black junk go into my mouth. If there were true particulates then I would be coughing up junk after chain-vaping, as has happened when I used to smoke cigs. This is just my observations, not based on any sources.~  "