Exceptionally timid and cautious infants tend to become shy and unassertive adolescents. this best illustrates the long-term stability of

This best illustrates the long-term stability of temperament.
Temperament refers to a person's nature - what their behavior is like and what their character is like in general. It refers to their emotional, physical, and mental traits which begin to develop in early childhood, but can change throughout life as well. 

Sometimes but itt depends, their is a lot if drugs on campus too so you really can't just say that