I read this article yesterday. It's kind of long, but interesting.
www.outsideonline.com/1810121/surfers-paddle-out-andy-irons

This is an article in response;
www.espn.com/action/surfing/news/story?id=5846080

Oxycodone gets a mention. Also known as Hill Billy Heroin, or artificial heroin.
en.wikipedia.org/wiki/Oxycodone
Wiki also says; OxyContin's (a brand of Oxycodone) warning label said to not crush the controlled-release tablets because of the potential for rapid release of oxycodone, which led to many people crushing the tablets and injecting or snorting the drug.