Define "today"...?
My grandparents and great-grandparents smoked, cussed, did various grownup things (not hard drugs, but probably only because they didn't have easy access to any), smoked pot (it was legal at the time, and the local cash crop), got jobs, and got girls in trouble when they were 13 years old. By the time they were 16 they had quite a lot of interesting jobs, were working 12 hour days, had intimate girlfriends/boyfriends (sometimes many), and drank everything that could be put in a glass. And that was not terribly unusual in the late 1800s/early 1900s. My great-grandfather, a real *ahem* gentleman, used to tell his granddaughters about his escapades at the local cathouse, as well as the various ways to leave town in a hurry.
Class
ay!
My parents thought they were seriously upright and well-behaved individuals because they didn't start smoking until they were 15-ish. My mother was a homely-looking teenager and didn't have a whole lot of boyfriends, but her younger sisters sure did.
In boarding school, the rules were that if your parents let you smoke and you were a certain age limit (15? 16? something like that) you could smoke only in the designated smoking room. There were rules about smoking in front of other people on special occasions--that is, if you were smoking and someone else was present, you were supposed to say, "Miss/Ma'am/Sir, may I offer you a cigarette?" but that was about it. We had to wear uniforms most of the time, or else nice dresses. This was when dinosaurs roamed the earth, so things may have changed since then.
What I am saying is, this has been going on since the dawn of time, there have always been teenagers who are bratty or un-parented. Some of them turn out lousy and some of them turn out OK. Plenty of polite, well-dressed kids grow up to run Enron and Wall Street. It's just life and all you can do is live yours.