Here's a trick you can play on your friend. Before he comes over next time don't smoke any weed. When you see him tell him you smoked a whole bunch of bud, and you hope he doesn't smell it. If he says he smells weed and he thinks he's getting high, then you let him have it! Say you weren't smoking any weed and it's all in your head. Then he''ll realize how crazy he's acting. Of course he might not be your friend anymore if you pull a stunt like that.