Should I say goodbye to all the friends who use drug?

I mean said goodbye to the people who use drug because they are unpredictable. And now there is this guy who uses marijuana. I mean he always go out and start babbling when he is high. I want to have a conversation but it seems like he is using me to cover him up. Have you had friend who use drug or marijuana?

Should I say goodbye to all the friends who use drug?
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