> Perhaps things would be different for someone in their 40s, who has a wealth of real world experience to draw on, philosophy would be valuable. But for the average 18 year old kid, studying it seems to create a set of terrible habits that take years to undo before the student can become a properly integrated adult.

In the time of Plato and Aristotle it was frowned upon to teach philosophy to students below the age of 35 because they wouldn't know what to do with that knowledge.