Not really. ADHD is well documented in brain scans that show a lack of activation and structural differences. You can actually see the difference between the brain of a person with ADHD and a control. It's not just 'having weak discipline' and 'not trying hard enough.' It would be like looking at someone with no arms and saying 'I believe that this person can pick up a ball but they just lack the discipline.' Nope, the structural basis to make that happen is absent. That's ADHD.
