Is cannabis definitely not a causal factor for schizophrenia?
...or are there needed some more studies to proof this truth, however well known in folk and every-day’s-medicine? Many people heal their psychic problems with hemp. This is the very proof that the inborn, intuitive sensibility for the simple but efficient folk medicine is still alive and widespread and must be promoted by facilitating access to natural therapeuctic hemp.
Israelian scientists propose that the association between cannabis use and increased risk for schizophrenia that have been observed in recent studies from Sweden, the Netherlands, New Zealand, and Israel may not be causal. Several studies have reported an association between genes encoding the cannabinoid receptor and schizophrenia.
The researchers write: "An alternative explanation of the association between cannabis use and schizophrenia might be that pathology of the cannabinoid system in schizophrenia patients is associated with both increased rates of cannabis use and increased risk for schizophrenia, without cannabis being a causal factor for schizophrenia."
(Weiser M, Noy S. Dialogues Clin Neurosci. 2005;7(1):81-5.)