Interesting. I have ADHD and find that smoking weed makes my symptoms noticeably worse. Depending on how high I get, I find myself largely unable to focus, or even to complete thoughts without becoming distracted. This seems to persist after I'm no longer high -- even many hours after smoking I still find myself less able to stay on task.
If you're of the hyperactive type I could possibly see some benefits? As an inattentive and non-hyperactive type it's hard for me to imagine weed helping very much.