The war on drugs is as winnable as the war on murder or the war on petty theft. Just because it doesn't go away doesn't mean you failed at enforcing it.
War on drugs is just a shitty political campaign slogan everyone fell for. It's a fantastic one from the perspective of the politician, because they'd never be held accountable for 'losing' it during their tenure.
The war on drugs is unwinnable because, in general, human beings want to take drugs. Or want to have the freedom to take drugs. Most people don't want to murder or steal.
100,000 dead annually from using would like to have a word. 70k of those are fentanyl by the way. Victimless though right? All those people could quit any time they want, right?