LDs and Controlled Substances?

Someone asked me this the other day and now i'm wondering too...
Will drinking/taking something like vicodin help with LDs, or make it harder?

I think it varies from person to person. For me, smoking helps me with every aspect of dreaming. And drinking only has a negative impact when I'm blackout drunk and pass out (I try not to black out, but sometimes it happens ;) ). If I remember going to bed, I remember my dreams.

does it tend to impair your ability to LD, though?
or not affect it?