Shin raises a brow when he's asked if he's been high this whole time, but skims past it. Instead he pushes, "you sure? It's fucking amazing." He's not going to push any further than this, and he's not really going to judge Marty either. He knows how stupid it is to be doing this crap. He knows he shouldn't even be pushing this on someone else, but maybe if it's not just him it would make it more okay.