Jan has used cocaine to the point where she has impaired control over her use of it. While she experiences no withdrawal symptoms when she stops using it, she wants it so badly she cannot stop herself from taking it. She has become ______ cocaine.
a. psychologically dependent on
b. physiologically dependent on
c. physiologically abusive of
d. emotionally attached to

In an addiction, there are two main dependence processes that take place: the psychological and the physiological dependence to a substance. It used to be believed that these two processes developed separately and that an addicted behavior could be separated into their psychological and psysiological characteristics. However, it is now known that human behavior, including addictive behavior, can not be separated purely into psychological and physiological components, it is much more complex than that.

Nonetheless, the term psychological dependence is still used to describe the emotional and mental processes that arise from a substance use disorder; and physciological dependence is used to describe the physical effects of substance withdrawl. In this case, Jan doesn't experience any physical symptom when she doesn't use cocaine, however she does experience mental and emotional symptoms that lead her to continue using it.