Trying not to be too judgemental, I would have to say any person physically addicted to an intoxicant that is phsyically and/or mentally destroying them does need some help to get better. But no addict totally creates themself as such. What does it say about a society that allows millions to detroy themsleves with alcohol but criminalizes and incarcerates someone who likes to smoke pot? Priorities not straight?
I think there should be some care exercised about associating the word 'addict' here with the name Boy George. None of us knows if he is an addict, and that point should be made clear.
As for 'appropriate behavior'. Again, this society has a big shame-based component. And a person can be addicted to worrying about how much shame they should be feeling as much as another person can be addicted to some intoxicant. History has provided many more examples than are needed of people who have destroyed themselves by feeling shame.
If the legal process works the way it usually does here, BG will get off with some probation and enrollment in a program to get clean. That is, if he ever really wants to come back to put himself on trial.