Back in the mid 90's I worked on a concrete crew for a few months. It was a big outfit building tip up buildings like box store type, maybe 50 guys on site.
Everyone (I think) did meth except me and one other guy, a Native American. It was expected. The pace was set by meth. Lunch was about 10 minutes. Often we would get to work like 3AM for pours. I lasted like 3 months and couldn't handle it any more.
After awhile guys would burn out and not show up. No big deal, replace them with another guy. I saw my supervisor later at a restaurant. He told me how he had tried at one point tried to commit suicide. The resulting impacts on the former employees lives (and the lives of their families and associates) wasn't the companies problem so long as the building went up fast.
That company is still around too. No, not going to name and shame.
While I'm generally in favor of people being allowed to put whatever they want in their bodies there is significant moral hazard and danger. Particularly with drugs like meth and heroin.