Yeah that guy saying hes addicted is just blaming weed for his lack of social skills and general tendency to be a hermit which means he'll most likely never see the truth and get better.

Im unsure about the schizophrenia. Im still very skeptical that weed can cause it but I think it might be possible to trigger it (maybe).

An other point I liked a little less was when that whole inhibition thing. He concludes that because marijuana reduces activity in the prefrontal cortex it might mean it can cause some mental illnesses. But alcohol is exactly the same thing and no comparison was made....