text: if a person is around somebody who is smoking weed, will the 2nd hand smoke affect the other person?? will it show on drug tests??? yes, especially if you are concentrated in it, you might as well be considered smoking it.  it is best to stay clear of these situations.  if this is just a one time deal, and was not for a long period of time, you may be in the clear.  always give your body a good flushing, drink plenty of water, cranberry juice, and eat lots of vegetables.