In the UK it appears that there's a Spice epidemic. It's often called "synthetic cannabis" or "(formerly) legal highs", but it in reality it's all kinds of research chemicals sprayed onto leaves to be smoked. It has some pretty hideous side effects, and seems very addictive ( https://video.vice.com/en_uk/video/the-hard-lives-of-britain... ) Oh, and the government just handed the whole market over to illegal drug deal…
The spice epidemic is mostly prison related though. Prisons should stop testing for cannabis; and should consider prescribing cannabis of known strengths (and higher CBD rather than THC content). (Also, they need to start providing a lot more mental health support and meaningful activity).
https://www.vice.com/en_ca/article/synthetic-weed-is-a-scour...