So I think you have to go on the internet and find articles! One that likes oils and thinksoils are good and then another one that is against oils and doesn’t like them! Compare and contrast them and highlight stuff that YOU agree with and then see if the articles are actually VERY convincing or not so much
You could say something along the lines of:
"Hey, Friend, what's so good about weed? Why are you always smoking it?"
If he's smoking it for medical purposes, then just drop it, but if it's illegal and he's doing it to "look cool", then I would further ask questions about it.
