You know, I was just thinking about this... Maybe they really are talking about Beryllium.

AFAIK, most "mind altering" or "mood enhancing" substances are extremely toxic, but if taken in small enough doses, won't actually kill you. Take Nicotine for example. It's one of the most toxic substances known to man. Just so happens that smokers don't actually get enough to kill them (at least not instantly...), so they get some kind of "mood enhancing" feeling instead. I'm not a smoker, so I'm really not sure what that feeling is, but they obviously get something out of it, or they probably wouldn't keep smoking.

Anyway, my point is, maybe Beryllium is similar in this regards. Maybe if takin in small enough doses, it won't actually kill you, but will actually make you feel some sort of euphoria or something. Not something I would try, but hey, it certainly won't stop everybody.