Sue Has Been Using Crack for About Two Months Now

Multiple Choice

Sue has been using crack for about two months now.Although she knows it is destroying her job performance,and she has already been reprimanded for missing work because of her drug use,she refuses to give it up.She says she can quit whenever she wants to and just uses crack because she enjoys it.She tells others who question her drug use to mind their own business and leave her alone.Sue's drug use is best described as substance ________.

A) tolerance
B) misuse
C) use disorder
D) over use