I'm really worried about my son. He is 20. Has had poor mental health for a few years since getting involved with weed in his late teens. I'm fairly confident it hasn't progressed to anything else but I'm devastated that weed has taken away my lovely, caring, happy, confident boy. He posted something online the other day about if you managed to stay alive this year that's enough. I got a phone call from the police a few weeks ago saying he was missing & my heart sank. He turned up ok but I can't help feeling one day he won't. What, if anything, can I do to help him?