Yep!

Symptoms of schizotypy precede cannabis use.
UKCIA forum :: Research :: Symptoms of schizotypy precede cannabis use.

Cannabidiol as an antipsychotic
Clinical Studies and Case Reports

Cannabis does not induce schizophrenia,
Cannabis does not induce schizophrenia, Dutch scientists say

Cannabis use does not cause schizophrenia
Cannabis use does not cause schizophrenia

Cannabinoids and psychosis.
Cannabinoids and psychosis. [Int Rev Neurobiol. 2007] - PubMed Result

Cannabis as a psychotropic medication
Cannabis as a psychotropic medication -- Chaturvedi 185 (1): 78 -- The British Journal of Psychiatry

Study Shows Long Term Marijuana Users Healthy
Erowid Cannabis Vault : Health Effects : Study #3

Cannabis and schizophrenia link blurs further
Cannabis and schizophrenia link blurs further - health - 16 April 2005 - New Scientist

Evidence does not show a strong causal relation between the use of cannabis and psychosocial harm
NLH - Mental Health - Aetiology - Review: current evidence does not show a strong causal relation between the use of cannabis in young people and psychosocial harm

No Increased Schizophrenia Risk With Use Of Cannabis
No Increased Schizophrenia Risk With Use Of Cannabis: The Hempire - [cannabis, london]