I bet it's spice
I'm too old to know much about it but I'm working with a couple of guys right now in recovery from the stuff and they say some of it can be real nasty, that you never know which way you might be going.
The scary thing today with some young people coming in with an addiction is that they've been taking amphetamines (or some other powerful med) since they were elementary school age, quit once they were grown, and then began to self medicate because they were going nuts. It's a sad deal because they are some sick puppies. I believe we are going to see things in this generation like we've never seen before because we've managed young growing lives (and tinkered with their brains) from an early age with some pretty powerful meds without really knowing what the long term consequences may be.