Now that it has been thoroughly disproved that marijuana doesn't cause lung cancer like tobacco does, and it has been proved that it doesn't kill brain cells (though many people still believe this)... Prohibitionist groups have moved on to finding studies that say that it causes "psychosis" and mental illness such as schizophrenia.
Though studies have shown that if somebody is already susceptible to these mental illness's, that using cannabis might cause an outbreak, nothing has shown that marijuana in itself causes mental illness.
NORML has put out an article stating that many claims have been "overstated"
Check it out here: Supposed Marijuana And Schizophrenia Link “Overstated” - NORML Blog
What's next for the prohibitionist groups? Look's like they're going to need to find something new to mislead the public.
