A Smithson (Smit or Smitty for short) is a joint rolled partially with weed and partially with dried tea leaves (preferably peppermint). Smithsons are known for their cool and relaxing hits.
Steve: Charlie you rollin' up that j?
Charlie: Chill Steve, I got a Smithson goin right here.
Steve: Oh shit my man knows how to get it done. Good choice on the Smit, broski.