No probs, the link is: https://www.mind.org.uk/information-support/types-of-mental-health-problems/schizophrenia/about-schizophrenia/
My advice (for what it’s worth — I’m not a mental health professional, and I haven’t met your son, so I’m kinda winging this) is to give him the info., but not make A Big Thing. Casual is better. And if he rejects it? As hard as it is, I think you’ve got to accept that. He might come round if you’re patient, but if you push it he’ll double-down on the avoidance and defensiveness because he feels threatened. This is a big enough thing for him to try to get his head around, and teenage boys aren’t known for their emotional maturity, so if it was me, I’d say that softly-softly is the way to go. (As frustrating as that undoubtedly is for you.) But then, like I said, I’m not in your situation, and you gotta do what’s right for you.
There’s also info. on drugs and schizophrenia here: https://www.mind.org.uk/information-support/types-of-mental-health-problems/schizophrenia/causes/#DrugAndAlcoholUse and about the affcets of recreational drugs on mental health here: https://www.mind.org.uk/information-support/types-of-mental-health-problems/drugs-recreational-drugs-alcohol/effect-on-mental-health/
Hope that helps — remember to take care of yourself, and your own mental health. And always focus on the love — you can’t go far wrong that way, even if it feels like you are ❤