Simply the substance used.

Substance abuse and substance dependency A+ :)

Substance use disorder is the condition of substance abuse and substance dependence. A substance use disorder could include disorders such as dependence on alcohol and dependence on narcotic drugs.

Substance abuse and substance dependence are two different things. Substance abuse- is when someone is using a substance more than directed or they are using it for different reasons than what it is for. Substance dependence- is when you have developed a need physicall and/or mentally for it and without it your body in some way experiences a withdrawl.

true

Substance abuse and dependence refer to any continued pathological use of a medication, non-medically indicated drug (called drugs of abuse), or toxin.