Can you get high from secondhand marijuana smoke?

Yes. One can get high from second hand marijuana smoke, if he is in an enclosed space with a smoking person for a long enough time. The amount of active ingredient one inhales depends on details such as: how small is the enclosed space? How long does he stay there? How much smoke is in the enclosed space?
Depends. Depends on genetics can cause buzz, people who are allergic can cause asthma so affects how strong the effect depends on genetics.