Talking about the ADHD thing, there's a similar problem with some research that claims stimulants cause Parkinson's disease. The study authors didn't seem to ac

Talking about the ADHD thing, there's a similar problem with some research that claims stimulants cause Parkinson's disease. The study authors didn't seem to account for the fact that people with more severe ADHD would be more likely to be treated with stimulants and that severity of ADHD could instead be the causal factor.