He'd sort of been joking when he asked that, though of course it would have been nice to have a clear and easily discovered answer. What she tells him, not from her talent but just, apparently, her experience, catches him rather off guard and he just blinks at her for a moment.

"What?" he sputters. Christ, maybe she just thinks he's some sort of junkie who staggered in here. He supposes he can't blame her. "No, that's... I'm not on anything. Not even medication, I... I've never even smoked... anything, not once." Some mates at school had dared him to share a cigarette once, and made fun of him when he'd chickened out. He'd always prided himself on the fact that he hadn't given into the pressure, as humiliating as it was to endure.

He doesn't even really know what withdrawal looks like, and he wonders if Yona really does know this, or if she's simply guessing. She had sounded very certain. And she doesn't seem like the sort who'd just make something up.

"I'm sure it's just... low blood sugar or something," he says faintly.