What can show up on a drug test for marijuana even if you don't smoke marijuana?
yes it can be a false positive.
If you were around people while they were smoking marijuana for the past few days would it show up on a drug test?
Yes, secondhand smoke of any kind is harmful to children. You should not be smoking marijuana or cigarettes for that matter in the presence of children, or even at all; it shows horrible responsibility and lack of caring/respect. If you smoke marijuana in front of children they are going to get the effects of the marijuana as well.