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.
Answer:
Better Image Quality
. ...
Demands Less Resources. .
..
Allows for Higher Quality Care.
...
Relatively Easy to Use
. ...
Quick Image Sharing.
...
Easy Image Storage.
Explanation:
just pick three answer
