They forgot the teenage binge-drinkers. You know, those teenagers who were given a questionnaire about their drinking habits and promptly went all 'Oh yeah. I drink, like, nineteen pints a night me. At least. And take loads of drugs. And have sex in bus shelters.' Exactly like you'd expect teenagers to. Show me a teenager who can afford nineteen pints a night and I very much doubt they're in any way typical.