This is my understanding around how Tor may be used to circumvent a country's censorship of particular sites:
John lives in a country that has blocked traffic to a particular server (via DNS, I assume?).
John jumps onto Tor, and now his traffic is sent to a different DNS server since his exit node is quite possibly outside of his overly-strict country.
He can have access to the site, great.
The question is, I don't live in a country that has this kind of block in place. But supposing it was me logging onto Tor, is it not possible I could hit an exit node that was from John's country? Thus being subject to the DNS server that blocks traffic to the server to which I'm making a request?