To those that have never read Eugene Monroe's twitter, he is an avid supporter of medicinal marijuana. Not because it's 'recreational', but for the health benefits as opposed to opioids. He has now kicked off his website eugenemonroe.com to support the cause, and also a facebook group.
The first post on said facebook group contains a stat showing, "71% of NFL players who reported taking opioids admitted to misusing them."
Painkillers has been a very 'hush-hush' topic in the NFL. People know about it, players know about it, but it is not discussed. This seems to be quieter than the CTE discussions.