I worked concrete construction for about a decade, and was living in NYC on 911. I figure complications from asbestos and silica exposure will take me out in my late 60's/early 70's before congestive heart failure gets me in my 80's (like most of the men in my family).
I started working for a larger company in NYC and they had safety classes for new workers that included silica education. I had no idea before then, but always wore an N95 afterward when working with Portland or doing concrete demo. But I still had years of exposure from my youth. We were completely unaware of the dangers
Companies have known the risks of silica exposure for years. Many have blood on their hands.