Practically, any substance that gives a
pleasure, but is also
deadly and dangerous. Therefore, it's labeled as such, trapped in dogmas, and/or under any kind of doctrine. Illegal, unsafe, unhealthy,
deadly, risky, etc.
Person A: Have you ever tried some Devil's
Candy?
Person B: No, what's that?
Person A: I've got some Heroin, an Afghan
Brown, at a cheap price. Trust me, it's the best piece of
candy you'd ever try!
Person B: OH!.. HOW MUCH?