1. [Yes, this is Barack Obama][1].

2. He has been known to smoke pot: ["*I inhaled, frequently. That was the point.*"][2]

3. I can find no evidence that the claim is true.

  The first online reference that I could find to "Barack Oganja" as an early nickname for Barack Obama is on May 18, 2012:

 * https://www.facebook.com/fact5/posts/366700466713262
 * https://twitter.com/FactBoook/status/203585034484068352

  This is consistent with [Google Trends][3] not showing any activity for this term before June 2012.

  ![enter image description here][4]

  One individual created this nickname for themself prior to 2012.

  *  https://soundcloud.com/madfatdubsbro

  One user attributed a Barack Obama quote to "Barack Oganja" on December 4, 2011, but didn't claim it was a nickname from his younger years.

  * http://freak.no/forum/showpost.php?s=6445eb8566606c81c72b80e19cd1b731&p=2364430&postcount=20

  Two marijuana growers named a strain of marijuana "Barack Oganja" (reported December 4, 2009)

  * http://thephoenix.com/Boston/Life/93793-weed-grows-in-Boston/?page=4#TOPCONTENT

  One blog called Barack Obama "Barack O-Ganja" in a headline on October 26, 2009, but didn't connect it to a nickname from Obama's earlier years.

  * http://theburbslife.com/2009/10/states-dealing-with-new-ganja-law/


  [1]: http://www.thesun.co.uk/sol/homepage/news/4340353/Yes-weed-can-Biography-alleges-that-the-US-President-Barack-Obama-used-to-smoke-pot.html
  [2]: http://www.youtube.com/watch?v=cpBzQI_7ez8&t=57
  [3]: http://www.google.com/trends/explore?q=barack%20oganja#q=barack%20oganja&cmpt=q
  [4]: https://i.sstatic.net/9whJ0.png