Flutterby™! : Biden pardons simple marijuana offenses

A Proclamation on Granting Pardon for the Offense of Simple Possession of Marijuana, Attempted Simple Possession of Marijuana, or Use of Marijuana

Therefore, acting pursuant to the grant of authority in Article II, Section 2, of the Constitution of the United States, I, Joseph R. Biden Jr., do hereby grant a full, complete, and unconditional pardon to all current United States citizens and lawful permanent residents who, on or before the date of this proclamation, committed or were convicted of the offense of simple possession of marijuana, attempted simple possession of marijuana, or use of marijuana, regardless of whether they have been charged with or prosecuted for these offenses on or before the date of this proclamation...

Obviously this doesn't undo much of the harm of prohibition, and definitely doesn't go anywhere in trying to undo the harms of all of the cascading on top of the basic charges, but it's a start.