My son when initially diagnosed the psych doc said the pot did play a part in the sz. He was not sure which came first the sz or the pot addiction. 50% of the mental health people self medicate with street drugs as they want relieve from the mental health issues. I have also read in other books that pot and sz are linked.
My son has done so much better when he was able to work on the psych meds and the addition ( pot & other things) at the same time. He has been clean and appropriately medicated for 3 1/2 years and is doing very well. He struggled for a while ( few years) until he decided to do what ever it takes to get his life back.
He was also living in assisted living out of state and I did not have a solution to get money and cigarettes to him easily, so he moved to evapor. I could mail the juice once a month.That has worked well as he has decreased his nicotine content over time. I decided to fight the drug addiction issue ( and won) and how am working on the stop smoking issue.
He now lives semi-independently with his sister.