First Filter
I don't know exactly either. But Cas isn't so hard to talk to. Elena's brother was a complete stoner for a while, and so was Matt's sister. So it's not like he's the first drug loving person I've talked with.
Fond of Cas is still... a good thing. Does he talk to anyone else here very much? I saw there was the other Crowley, one that for being a demon could possibly be a good influence on him.