My wife is 4 months pregnant. she was exposed to the second hand marijuana smoke for a few mins, will if effect our unborn child.

No harm done: A few minute exposure to marijuana smoke will not harm your baby.

Let me explain: According to dr david barrere, a board-certified ob/gyn in cincinnati, ohio, studies on the fetal effects of maternal marijuana use during pregnancy are quite limited, and the study of second-hand marijuana smoke is non-existent. But rather than meaning there's not a problem, it's really that the testing, in and of itself, is dangerous.

Doubt it: There is no evidence on this and exposure seems minimal. If she avoids enclosed spaces with significant concentrations of smoke, there should not be a problem.

Not likely...: That is a very small exposure.