I live in a dorm, and I usually smoke by myself so I don't really have to worry about Commandments 1 or 3. As for 2, I always got 'em so I always smoke 'em. I don't really smoke in short concentrated sessions but I keep my bowl around and toke on it occasionally when I feel appropriate. I never smoke joints...well, I might twist one up if I've got a lot of leaf because then I can afford not to take in every puff of smoke like when I have quality bud, but if I'm gonna smoke a joint I go outside for a little stroll through thinly-populated areas.

So I voted for #5, don't get all paranoid and shit. It's the only one I have the occasional problem with here in the dorms, but as my mother always says, paranoia is just good thinking when they're really out to get you.