If one of your goals is to cripple the thriving black market and all of its accompanying ills (mainly violence) then you can't continue with prohibition because

If one of your goals is to cripple the thriving black market and all of its accompanying ills (mainly violence) then you can't continue with prohibition because it allows the black market to continue to thrive by generating scarcity. Drug prohibition has been poisonous to social harmony, civil rights, and the rule of law since its inception. It was never a good idea; and it is time to admit that and move forward.