Making a little spliff is all you need to do. All you need is a empty toilet paper roll, a rubber band, and some dryer sheets (like bounce). You get a one hitter and get by a window and hit that and blow it thru the spliff out the window. You are golden!
I have no idea about the bus thing. I'd say if you had a backpack you should be good. Just stuff some dryer sheets in there and you are once again golden!