The top and the bottom ones are studies regarding the heavy use of Marijuana, which is ABUSE. Responsible casual use will not have the same results.
From the top one:
Key word: HEAVY USEThey found that heavy use of marijuana caused the type of abnormalities in certain areas of the brain as were found in the brains of the subjects with schizophrenia
The middle one states an obvious fact: everyone knows Marijuana makes you paranoid when you are on it. Here's a quote from it^Only shows that it has temporary schizophrenia like effects. Everyone knows that.Some subjects developed symptoms resembling those of schizophrenia that lasted approximately one half hour to one hour.
From the bottom one:That is a ridiculously large amount of weed. I would think that someone would have some problems if they smoked that large of an amount. I could not even smoke that much if I tried.George is a heavy dope smoker, he smokes twenty to fifty cones a day. Now he’s volunteered to be in Martin’s study.
Legalization would possibly have a slight increase on casual use. However, I highly doubt it will cause a large amount of people to start abusing it heavily.
Do not accuse me of shutting my ears to anything here when I have responded to all counter points here, whilst you have mostly just spewed out random articles on studies showing health defects.