First of all, smart dust is NOT LIKE DUST
The photo has an example of a tiny computation device known as smart dust.
As you can see, you will not be breathing this into your lungs.
When marketing people make up names like smart dust,
They are using metaphors
They don't literally mean that dust particles are suddenly made smart
If people refuse to do research and learn what is really being talked about
Then you are going to be manipulated by unscrupulous posters of copy pasta
https://edtechmagazine.com/higher/article/2019/03/smart-dust-could-ramp-internet-things-higher-education
https://theintelligentminer.com/2019/04/09/the-intelligent-guide-to-smart-dust-in-mining/