I had my first experience with a very similar situation yesterday. I posted it in the Experience forum. It's called "Close Call". I was thinking as well, what I would have said if they asked me what the smell was. I was thinking something like "I left my jacket at my friends house and his brother from college liked it and wanted to wear it, so i let him, and they were smoking" or something like that... or, I have no idea really, because that's not really believable if you reek of it.