A good realistic science-fiction book you might like is "The First Immortal" that shows that the natural long-term economic pressure to end prohibition is immense; even if the short-term favors bigotry. (The author, James Halperin, believes this is because we can't have prohibition without totalitarianism, given the exponential increase in technological power. The white voting majority is stupid and self-contradictory when it comes to drug rights, but only to the extent that they themselves can avoid their doors being kicked in. They won't be able to have this "double standard" forever.)

Here's a free copy of it, in case you're interested in reading it:
https://coins.ha.com/information/tfi.s?type=-FIRSTIMMORTAL.COM

Stay Strong.