Marchiori E, Lourenço S, Gasparetto TD, Zanetti G, Mano CM, Nobre LF. Pulmonary talcosis: imaging findings. Lung. 2010 Apr;188(2):165-71. doi: 10.1007/s00408-010-9230-y. Epub 2010 Feb 13. PMID: 20155272.
Here’s a reference on talc! In short, it really can bugger up your lungs.
The argument that we inhale all sorts of other stuff so what harm does it do , was used by the smoking lobby for years.
We do put it on babies bottoms but that is not inhaled , although it may reach their peritoneal cavity where it is is linked to ovarian cancer etc in women. Better to use corn starch powder ( I’ve actually tried it in dope, seems to work ok) .
Happily in these days of Covid 19 we all know about masks! I’d be wearing an n95 for all vigorous sanding, unless outside with a tailwind!
Cheers Dr Phil ( very novice stunter, but better than novice doctor!)