hard one drop,
my humble opinion is that the organized crime requests crime,
if drugs were legal the crime would sell them cheaper, and the money they need for armory will be achieve by other types of crimes, like kidnap, or robery.
It would reduce carceration population even, but there would be more criminals on the street with heavy weapons ready to find a way to exploit the society with crime.
It is a complex question, you can base on countries that legalised drugs and see statistics of crimes.
I am not in favor of drugs as you can see.