Last night i believed i smelled marijuana coming inside my house from the neighbor. what are the odds of getting high from second hand smoke?

Zero: There have been rare cases where people were inside a car where 4 people were smoking marijuana, or in a very small room, where enough was inhaled to be detectable in a drug test, but even there probably not enough to cause any psychoactive effect or "high." from smelling marijuana smoke from a neighbor, the chances are close to zero that you could have any effects at all.

Unlikely: Unless there is a pot-smoking party , it'd not be enough for you to get a high from it.