As far back as middle school or even grade school, it was relatively easy to determine which students would grow up to make something of themselves and which would not. A person from my 4th grade class who we all knew was trouble was recently sentenced to nine years in jail for stealing a state vehicle. It's doubtful that anybody is surprised.
Though there clearly are exceptions, the general rule is that good, well behaved students have a better chance at success than bad, poorly behaved students. But success isn't the only thing that matters. Health does, too, and new data on high school students from the CDC shows a consistent link between a student's grades and healthy or unhealthy behaviors.
Does Unhealthy Behavior Cause Bad Grades?