Wanting to do away with it doesn't mean ban it all immediately to try and force people to be a new communist person. It would whither away. If some of it stays around, it stays around, but differently than it did before. I think the approach to drugs is similar to the approach to religion. Teetotalitarianism is a lot like state atheism in my mind.
It's not like I'm currently a teetotaler.
CW
I say this after caving and smoking weed again after being clean for a week because dysphoria, nicotine withdrawal (also a week out), and drinking spurred me to self harming the other night.