"... using pot at 16 years old was linked to psychotic symptoms three 
years later, and psychotic symptoms at age 16 were linked to pot use 
at age 19. This was true even when the researchers accounted for 
mental illness in the kids' families, alcohol use and tobacco use. 
Griffith-Lendering said she could not say how much more likely young 
pot users were to exhibit psychotic symptoms later on. Also, the new 
study cannot prove one causes the other. Genetics may also explain 
the link between pot use and psychosis, said Griffith-Lendering."

http://science.slashdot.org/story/12/12/26/2148203/link-between-marijuana-and-psychosis-goes-both-ways

http://www.reuters.com/article/2012/12/25/us-kids-psychosis-idUSBRE8BO07D20121225

http://onlinelibrary.wiley.com/doi/10.1111/add.12050/abstract;jsessionid=D3A3307814FCDB4AF637BD416483FAEE.d01t04 


"People Who experience mood swings, fear, voices and visions"