That's backwards, if anything they need to legalize all drugs so that drug dealers stop getting all the money, and they'll mostly go away on their own when they can't make a profit anymore. Giving drugs to kids should be a severe punishment, but adults should be able to buy drugs legally, and anyone using hard drugs that overtly harm your health (which is most of them) should be required to go to therapy on a regular basis in order to obtain the drug they're addicted to as a way to get them to stop. And that's not a perfect idea and it certainly needs tweaking to make it viable, but it's a hell of a lot better than funding the black market and organized crime by leaving them illegal, not to mention criminalizing users which prevents most of them from being able/inclined to seek help.