Connecticut recently had a mass overdose of K2 which you have probably seen in the news in the past week or so.
"...The drug is often marketed as an alternative to marijuana, but it's effects are very different and potentially dangerous..."
Unfortunately it gets confused with Marijuana by those that do not know or "care" what the difference is.
The following link gives a pretty reasonable explanation of what exactly K2 is VS. Marijuana. I think it was posted in the New Haven Patch a few days after the 76 or so OD's on the Green.
https://patch.com/connecticut/newhaven/what-k2-drug-behind-new-haven-mass-overdose