those studies are not completely credible i have studied psychology and there is no way to tell if it actually causes it the only thing they found hard evidence of is if someone has it and smoke marijuana they have a chance of developing it sooner but that was never completely proven schizophrenia is not even completely understood so trying to blame marijuana for it is asenine also as a side note 30 days of not using marijuana your memory returns and it is completely out of your body it has also been proven that caffeine is more addicting than marijuana while nicatine is more addicting than cocain so put that in ure ass and smoke it