There actually are LSD analogues (the 'sunshine acid' is hypothesized to have been ALD-52). But neither they nor good old LSD-25 do this to you on their own. I've seen people suffer psychotic breaks, but never any growling cannibalism as the result of a bad tryptamine trip.
What I find strange is the noise being made now about "bath salts" MDPV
being behind this, as if there was a shred
of evidence to support such a conclusion - there isn't any, aside from some unfounded assertions of authorities who belie ignorance with every statement.
Don't get me wrong, MDPV is nasty, NASTY stuff, but they're grasping at straws, and seemingly using a horrific and unexplained tragedy to bolster outrage against a substance they wish to see banned more strictly. Reefer madness indeed.
Based on the facts, they could say Eugene was a wendigo, and this actually has more evidence behind it seeing as he actually ate human flesh. We'll have to wait for toxicology reports to know for sure.
edit: just in case I didn't state this clearly, consuming bath salts is a bad fucking idea.