cannabis lets schizophrenia break out more easily, if it is latent in the user.
of course there is a difference in the break-out-types in the users and maybe the way they are using the substance (e.g. frequency, amount of weed taken) has an influence as well on "their schizophrenia".
basically i think this could be, because cannabis tends to open the mind (expand consciousness), and therefore bring subconscious thoughts or memories or emotions to "the light of the consciousness". obviously some users have problems then accepting their own thoughts or emotions, which they had previously not even known that they had such thoughts in their "latent mind".
but well, as i see it, cannabis only works as a catalyst for these type of persons, so the plant itself cannnot be blamed in my opinion.
the ones who can be blamed is the ones who don't provide the necessary information for the user, but well schizophrenia is always a chance i think, because if you know yourself or others know yourself you can probably solve some personal issues of yourself by using this plant or by introspection in your schizophrenic mind.
peace :weedman: