[rpedroso]

Actually yes:

https://en.wikipedia.org/wiki/Synthetic_cannabinoids

They typically cause more severe side-effects than traditional marijuana. There have been a few rounds of subway ads related to synthetic marijuana.

[Redoubts]

And to follow up, with a NYC example:

http://www.nytimes.com/2016/07/13/nyregion/k2-synthetic-mari...