Originally Posted by bOsscO

If you're flatting more on gravel rides than road rides, you're doing something wrong or there's something wrong with your tires.
Silicosis is (almost) always a result of chronic exposure at work, typically associated with concrete cutting, mining, steel fabrication, construction, drywall installation, glass manufacturing, etc. I'm no doctor but I've not heard of a case of silicosis from gravel riding.