I am well aware of the deleterious effects of addiction to cocanoids or opiates. And I don't necessarily favor legalizing them entirely, although I think between legalization and the currently spectacularly ineffective "war on drugs," I would pick legalization, if only to put a gigantic, possibly mortal, hole in the economy of the international drug cartels.
I think they should be decriminalized, though. Right now, many addicts don't get treatment, don't get help and support, don't even necessarily have clean needles (for those who use needles) because they are too afraid of being sent to jail. And let's be clear: jail seldom helps addicts, both because prison treatment programs are overcrowded, underfunded, and poorly run, and because there is a thriving black market in prisons which makes it comparatively easy for prisoners to get drugs.
I think that decriminalizing these drugs will not particularly increase usage-- most people who want to use cocanoids or opiates already do so while they are illegal-- but it will ease the creation of treatment programs and needle exchanges, and it will permit states to redirect the billions of dollars currently being wasted in trying to chase down addicts, petty dealers, and other small-time riffraff. Hopefully much of those wasted dollars could then be used for health care and providing decent treatment programs that might actually help addicts kick their addictions.
Draconian drug laws have not only proved pathetically ineffective, they have proved to be racist and classist-- in application, if not in intent-- they have proved to be wasteful of government monies, and they have fostered the creation of the prison-industrial complex, and severe overcrowding in our regular prisons. They clog up the justice system with petty cases, they ruin people's lives over trifles or over uncontrolled illnesses, and they provide economic bonanzas to the international criminal cartels by creating a vast, uncontrollable black market.
If you want to argue that we ought to have better drug education programs in our schools, that might be something I would support: realistic, pragmatic education that combines reliable medical facts with the realities of life as an urban teenager today is something we need, especially considering how fatuous and simplistic and puritanical our drug education materials have always been.
But prevention is one thing, and punishment is another. Addicts don't need punishment for addiction, they need help kicking addiction. And right now, not only do we not help, we hinder. Draconian drug laws dehumanize addicts, and are a never-ending drain on our resources, dragging our society down. They are, practically speaking, ineffective; and they are unethical at best, immoral at worst. They are without redemption. Their effects are far worse than even full legalization would ever be likely to be, much less decriminalization.