You might want to take a look at this video from the global forum on nicotine conference. The silica/cotton issue is brought up (I can't tell you the time, but the whole video is well worth watching with a comparison between vaping, HnB, and cigarettes).
Another issue with an easy fix.
What is interesting is seeing the very low toxicology of both heat not burn and vaping compared to smoking. Without the smoke there really is a vast reduction of toxins. Most people, even in the vaping community, don't really understand just how significant the reduction in harm is.