Dunno about you but I received an education as to the effects of drugs from an early age. Didnt stop people in my class becoming junkies.
It's also about circumstance, did a lot of those kids ever have a tangible future? (going by the location, i'm going with no) People also need to know they have something to lose if they get addicted to something that isn't socially accepted, and i can only imagine for most of the North of England, prospects are nearly zero.
I have the distinct wonder of living in a local **** hole estate at the moment and i can attest that most of these people are deadweight, if not abandoned by their own parents, society certainly has.
We as a country are doing "society" wrong, it's as simple as that, as much as the Grand Forehead Cameron talked up big society and northern powerhouse, it was just appearances and worthless soundbites.