I dunno. That would be uber gutsy to solicit random strangers to buy drugs from you wouldn't it? Dealers have to be smarter than that. Users, not so much. Unless she knew the college kids who rented there before would have previous clientele that could randomly show up, I suppose. Even then, it would be dumb of her. Just like inviting the strangers in from the cold while they smoke is dumb. Oh wait, duh, probably...hey, you guys wanna burn one? No wonder they gave her a dumb look. I wonder if she invited anyone else in from the cold who took her up on her offer.
I sure wonder what kind of caption/info she gave if she did in fact send JH the supposed pic of black man/white woman.
But, if drugs are involved, I assume being out of drugs or particularly high on them caused Lucas to be "lost". I don't personally think drug dealing/dealers are directly involved, but anything is possible at this point.