The first reason that people do it is to self medicate, right? And this is essentially what i was explain earlier. People are dopemin deficient in a d h d. This may be part of the reason why they are sensitive to rewards. As we increase dopemine through substances for some amount of time, it may actually improve the ad h d. The second reason is a little bit psychological, ok? So this isn't something that we really understand the noro science well very well. But this is something i've observed as a clinition. I think there's a neuro vulnerability here, which is important. If we kand about your brain has substance use, like