I mean, it would be hard to argue that working 60+ hrs a week isn't also a health risk for someone else's profit margin.

But to be fair, I think that the self-assessment of increased productivity is a secondary explanation to why workers like their caffeine, nicotine, the various other popular stimulants, and now the panoply that is the archipelago of nootropics communities (oh yeah, and more research chems than you can shake a stick at).