Dang, Levi. What a thing to admit to while being on the defensive. Ange is definitely - if not momentarily - making a bit of a face when he says that, because she reads the implication that he must have tried a whole lot of stuff loud and clear. Seems like Levi's reputation really isn't lying, huh...

"Well, it was inevitable that this would happen sooner or later."

It's a convenient thing to blame whatever is happening to Levi on. Especially when Ange has no idea what it's like to use drugs, other than in the 'they're bad and don't do them whatsoever' stories she's heard. This fits right in with those.

"Maybe stop touching that stuff, and then you won't get bothered by weird visions again."