That sounds like such a tricky situation - weed is the most common drug that young people experiment after alcohol, so you're definitely not alone. We do have some good resources on our parents page about cannabis, its effects on the developing brain and ideas for how to approach those conversations with young people here, interestingly the academics that ReachOut talked to for this piece found that talking about brain development was one thing that really resonated with older teens like your son. We also have an article here about talking about drug use more generally - it can also be helpful to know why your son is smoking. Is it for enjoyment, to cope with other stuff going on, or a mixture of reasons?
I also really like @PapaBill 's advice above about involving your son in discussions around boundaries, and consequences for when they do get broken.
Do you think your son's anger and shutting himself away are a sign of a bigger issue for him at the moment? If you think he would be open to chatting to someone about what's going on for him, Headspace centres and eHeadspace can be a great place to start.
Keep us posted with how you're getting on :)
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