I think THC/Marijuana should be legalized. However, when reefer madness came out, pot was a lot less harmful. Back in the day, 60-70s pot was a lot less potent. Now we have super weed, hybrid strains, dabs, edibles, new ways of inhalation, that came make you as messed up as shooting heroin. And people are led to believe its harmless and they can drive. Studies show it can damage mental development up till the age of 25. (This is what the age to buy should be if legalized).
Leading to a sharp increase of auto accidents in legalized states. And what about the fact that long term use of the drug can make you a paranoid schizo/Conspiracy theorist.