I'm from New Zealand, our youth culture is based around two things- binge drinking and cannabis (often because it's easier to get than alcohol for under-18s). I'd say that by age 15 about 60-70% of them would be 'binge-drinkers'- the main thing is that here kids want to drink a lot, the 'point' is to be the person who drinks the most, who gets the most fucked up (just like it was when I was their age), but now it seems to be starting younger (10-13 rather than 12-15, and drinking at 12 made you a fucking badass...like, it was rare to do it 'as a thing' rather than as a once off at that age or younger) and once they're 16-17-18 they've often got a good half decade of drinking under their belts. This results in 16 year old drinking 3L casks of 10% wine/'cocktail mix' or drink an entire bottle of spirits in a night, when they're on the piss.
Cannabis is also pretty fucking common, it's almost universal in a lot of subcultures- something like 80% of people try it before they're 18 and I'd say there would probably be more regular weed smokers than regular drinkers, simply because of the combination of most regular drinkers smoking weed, the ease of availability and the large number of people who smoke but don't drink.
Taking 'pills' ('esctasy' aka mephedrone/methylone/mdpv/4-FA/3-FA/2-FA/6-APB/piperizines very very rarely something called 'M-D-M-A' I think

) is also almost worryingly common (must be showing my age or something), particularly as people get into their last couple of years of high school (and into university if you want to include that). I mean it's fucking ridiculous, people who would never take say LSD or a pharm morphine because that's 'too hardcore' happily grind up and snort and 'ecstasy' pills containing god-fucking-knows what!?
I met a 17 year old at this weird-ass party (it was like 2am, so the party was gonna go for another 8-12 hours...we party hard) who was boasting about having snorted 15 of these 'fucking bomb pills' so far that night. I asked if he had any left because I was interested/kinda concerned given how stimulated and wigged out he seemed, despite being coherant and 'with it'...he did and didn't hesitate on pulling out a big baggie with easily 150, if not more, pills ON THE FRONT LAWN OF SOMEONES HOUSE AT A OBNOXIOUSLY LOUD PARTY IN CLEAR VIEW OF THE STREET and the second he opened the bag to pass me one to see the imprint (and try to sell me one) I could smell the stentch of mephedrone. Smelling the bag itself, with all those pills, was almost overpowering. 17 year olds shouldn't be snorting 1.5-3g of mephedrone and drinking 4 bottles of cider on a friday night.
I'm not trying to be preachy, but I look at myself and I know that I was in their position when I was a kid and I made the same decisions at them and guess what- my drug use escalated and now decades on I'm addicted to opiates and have abused a long-list of drugs, some with incredibly destructive consequences. When you're at that stage when you're 17, what the fuck are they going to be up to when they're 21? 25? 30? Going at their current rate I wouldn't be suprised to hear about them shooting up 1/4g shots of meth at 21, a IV-opiate addict by 25 and dead at 30....if you see what I mean?