Teens aren't doing drugs, smoking, drinking, or having sex. And the suicide rate has never been higher.
I've had is persisting thought that, we as a society have been delaying adulthood, thus extending childhood, with each decade for a while. And we've now pushed it so far that the current cohort of teens simply are effectively young children on a social/emotion perspective making them unprepared to handle the stresses their age is exposing them to.
I would agree that modern childhood is protracted to what is perhaps a damaging extent, but would also argue that the stresses and anxieties of everyday life are more constant and overbearing than the human psyche is equipped to handle. It’s mot healthy for well-adjusted adults either. We’re built for dangers and stresses that come in relatively short bursts, not those that are without end.