I would take this with a grain of salt. Research on illegal substances is highly restricted.
That said, a friend of mine developed a psychosis after using Marijuana while he was still a teenager. Although there had been cases of Psychosis in his family before, not Marijuana induced though. It stopped eventually but came back years after when he took other drugs as well combined with a very stressful life situation, things went downhill afterwards.
That's already years ago, but my understanding that I got from reading articles about this topic at the time was that this activated some sort of latent psychosis. I also read about a proposal to introduce a "Cannabis driver's license" that could be made at a pharmacy. So people would be able to check before they take it. There are also people that feel positive effects of Marijuana, me included.
That said, a friend of mine developed a psychosis after using Marijuana while he was still a teenager. Although there had been cases of Psychosis in his family before, not Marijuana induced though. It stopped eventually but came back years after when he took other drugs as well combined with a very stressful life situation, things went downhill afterwards.
That's already years ago, but my understanding that I got from reading articles about this topic at the time was that this activated some sort of latent psychosis. I also read about a proposal to introduce a "Cannabis driver's license" that could be made at a pharmacy. So people would be able to check before they take it. There are also people that feel positive effects of Marijuana, me included.