Jumping off this post, a thought: If there is a 420 connection, maybe he knows/has a “dealer” that is not a friend from school, etc.
In other words, where does he get his weed, IF he doesn’t get it from classmates/friends?
Could there be a creepy older weed dealer?
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ETA: This reminds me, some people buy weed via SM, CL & FB. Just saw a case here where the buyer, a sweet girl who wanted donations on her birthday to a senior dog sanctuary, was robbed and killed by three teens.
Could he have met someone for weed?