I happened to stroll in a friends house on my B-Day and they happened to be smoking pot. As soon as I noticed I went into another room, I could smell it but not necessarily see myself inhaling the smoke. It was just two dudes smoking a little pipe. That was on friday, today is tuesday and I have to take a drug test. Is there any concern? The room wasnt really smokey, but whos to say. I did eventually go out when they were done, but maybe it was still lingering. Last I smoked was about 9 months ago