I just emailed his roommate some direct questions asking him how much this guy really drinks and smokes, and would he recommend him to me. Waiting on him to response. Thing is, he roommate was drunk that night too. And he also went out for a smoke with him.
The roommate will tell you whatever the potential date wants you to know. Ask him directly...you think they don't talk? Normal people talk. To each other. Not through roomates. They obviously both drink and smoke. I think you should ask the roommate what he thinks of your intervention you are planning on doing. I bet that would get back to the potential date so fast it would make your head spin.