Since this thread has popped back up I'll chime in. I was in charge of looking into the tightened OSHA rules for contractors when I was at MAPEI a few years ago and have to deal with OSHA regulations for my factory now. Some points to keep in mind:

Silicosis is a real thing and you should wear a respirator or use HEPA dust collection if you're generating respirable, crystalline silica dust.

Respirable silica dust is really small, typically not the visible dust you kick up at a job site

Products that don't contain crystalline silica won't cause silicosis. There are mortars and grouts available now that don't. Tile and stone only do if you dry grind/cut them.

Silicosis develops due to repeated exposure over a long duration, generally decades.

There are limits out there considered safe and testing can be conducted to determine if you are above or below them during a certain activity

Educate yourself, protect yourself!

Related Thread
 

Dan Marvin was responding to this thread in the Advice Forum about the subject of Silicosis that has popped back up a few times over the years. The links in his post may be of use to others concerned about the subject.

His first link is to a Department of Labor, OSHA, publication of unknown date.

His second link is an article from the NTCA's Tile Letter of June 2018.