no BF, i think he's right, he'd miss air more than weed... until he realizes he's got all of about a minute or so (depending on lung capacity among other things...) before he's about to literally die without air, as opposed to the exageration of i'll die without weed... lol

dude... you're thinking too hard and being too paranoid.... ask him what he does all day.. make small talk.. then be like "so do any of you friends back home ever try to get you to smoke weed?" and go from there, if he says something along the lines of yes and he smokes, then you know where to take that... if says something along the lines of yes, but i refuse, make small talk along the lines of "yeah it's happening to me alot too, they make me uncomfterable when they ask" and if he says something like "no they haven't" then be like "so what would you say if someone did?" again, you should know where to take it from the answer...

it's not that hard to find out if someone wants to smoke without absolutely trapping and incriminating yourself.... of course if you just don't want to smoke with him at all, just put it off... you won't die without it...