It's his choice so let him coordinate the activities to distract himself. I've heard by at least a thousand people that weed isn't addictive. I firmly believe the opposite. Also, some say it reduces their nausea (as spoken by a pregnant woman...) and offsets anxiety. I believe studies have shown that weed actually causes these symptoms. Duh! So, having said that, prepare YOURSELF for the ride if you're so inclined to go on it with him.