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.