Comment by berberous

Yeah, I'm highly skeptical it's overall safe. You have all sorts of metals, liquids, plastics, flavoring compounds, wicks, etc. Some people try to select 'healthy' choices (like organic cotton for the wick); maybe that's healthier, maybe it's not. But then you also have tons of cheap devices on the market, made in China, with who knows what as the cheapest metal/fabric, and then literally tons of unregulated flavoring compounds on top of PG/VG. Any one of those components could be harmful.