My offspring is a recent Andover grad. I read the SOTA the year the kid applied and during his time at the school. Keep in mind that the SOTA is run by the school newspaper so technically the information is NOT collected by the administration. My understanding is the school does not directly address any of the results with the students.
From what I understand, the substance use and hook-up culture is there if one wishes to participate but is easily avoided and there is little peer pressure. I did not get the sense that it is pervasive. My read of the data supports this.
On a somewhat related point, while a number of kids were exited or chose to leave the school, my child thought the school got a little soft on discipline over his time there. He thought there were children who violated rules during junior/senior year who may have been exited freshman/sophomore year for the same offense.