Answer:
I've sat in a car with my buddy while he smoked an entire blunt to the head, needless to say i didn't feel anything at all, note the fact the Entire car was so foggy we could barely see, if i didn't get high off of that, i don't think there is a such thing as a contact buzz, plus i heard that marijuana needs to be directly inhaled to feel the effects. or eaten. ya know.. so i hope i helped...peace