Ultimately, I have no problems with what one chooses to expose themselves to...in fact , Have @ It. If it ’boats your float’, hold your breath and dive....
I’m just ’suggesting’ in my weird way to take precautions with that one doesn’t typically ’handle’....esp. with ’nano’ anything, nor mica, or ?
My precautions are as follows -
With nanoparticles or any potentially hazardous chemical in powder form, wear appropriate protective gear. Work outside. Mix the particles into a PVA glue slurry as quickly as possible. Once the particles are thoroughly mixed with glue and water, there is little or no risk of inhalation.
Mica is commonly used in soap and cosmetics. You can literally eat titanium dioxide (it’s the white stuff in marshmallows) although it will be banned soon as a food additive. Tourmaline powder has health benefits due to its ability to release negative ions.