Roscoe doesn't have a clue what he's talking about when it comes to theology (as was shown by Belloc, re: Jansenism). He appears to be lashing out in petty anger because he wants to hold onto the sin of getting high. He has never answered (as far as I have seen) the question of how much pot he smokes and how often.
I doubt he will, because we will then learn that he is a truly chronic (i.e. immoderate) pot addict.
He can correct me if I'm wrong, or he can ignore me or lash out some more.