What right do you have to say whether the enjoyment someone finds in a vice is offset by the damage it does to their health or finances or social life? And for any given vice, usually the ill effects are a function of how heavily one uses the vice. So does a full ban to save the few who overindulge balance against depriving the rest of the option to make small trades against their own lives for some pleasure? Should we ban alcohol to save the alcoholics at the cost of everyone else being able to unwind with a beer? We tried that and it didn't go very well.
Evidence seems to point to education and access to treatment being far more effective than bans. And it's very difficult to get any kind of long term results by involuntarily treating someone, so I'm not sure there's much to be gained by criminalization with enforced treatment instead of just punishment.
At the end, you pretty much have to let people make their own informed decisions. Anything else sounds like a step toward an authoritarian state dictating everything you do.