brain-burned and brain-fried
mod. brain-damaged from drugs.The kid is a little brain-burned, but still has a chance at an independent life.Man, you're gonna get brain-burned from this stuff.
burned out
mod. no longer affected by a particular drug.It's no good. I'm just burned out. The stuff doesn't affect me at all.She was burned out on Q.
burnout
n. a person who is ruined by drugs.The kid's a burnout. What can you do?Two burnouts sat on the school steps and stared at their feet.