Oh I know it is more dangerous than real pot. Not that I want either, but I'd vastly prefer real pot. There was a point where he decided to go into the service (long story, there was a girl he was dating, she was pregnant (not his) and he wanted to support her) and went to the Marine recruiter with his dad...and they wouldn't take him when they found out he'd smoked synthetic. They might have with the real thing, but not synthetic. They suggested the Army, but told him it would be iffy. Which makes sense, because there's NO way to know the long-term effect of this stuff. He would have lied to the recruiter if his dad hadn't been with him...and there are times I wish he had...but realistically, the Corps would have been no place for him. He'd likely get beaten or booted or just go AWOL. He had no interest in any other branch.
I know he's smoked the K-2 type of synthetic. The stuff we caught him with was "Atomic Potpouri". Not Spice, thank God...I know what that will do. Really, the time we caught him was scary. He was slurring his words, could barely walk, was over it for the most part in about an hour. The high is apparently much stronger and lasts less time. We've talked to him about that until we're blue in the face. His "it's just herbs sprayed with chemicals" response floored me. It's the chemicals that are the problem! Does he think there's any quality control there? One pack may not hurt you...the next may cause brain damage! But it's "legal" (which it really isn't in my state, we have laws about synthetic pot) but still you can buy it in the store until the authorities figure it out and ban the particular type. So he can get it without going to a dealer. It scares me what else he may do that's "legal".
It's almost enough to make me think Colorado has it right. Of course, since he's only 18, he couldn't buy there either.