Probably illegal still so Jails can continue to make more money.
Why the forget was weed made illegal to start with?

You'd be
very hard pressed to say that marijuana is worse than Tobacco or Alcohol, yet both of those are legal. Not because they're good for you, but because they're so widespread. They tried making Alcohol illegal, and they saw how well that went. They weren't gonna risk it again. That's 100% for sure the only reason Tobacco is legal, because that stuff is so harmful it's not even funny how many lives it's ruined.
They could get away with making the others illegal because they were already rarely used there would barely be any outrage and they knew they could make a hell of a lot of money off of jailing people for it.