lol. You keep smoking em? I don't understand why people collect roaches. They smell and taste like shit. Just throw 'em away, I say! I have a friend that freaks out whenever you throw a roach away, so I do it all the time around him. hahaha
What you should do, is when he's about to roll a blunt, just eat all of the pot in one mouthful. He'll probably freak the fuck out(he sounds like one of those "scavenger" type potheads.) The ones who will scrape up the scraps of their post to smoke.