A
Any substance, natural or artificial, other than food, that by its chemical nature alters structure or function in the living organism.
Drug
Drug that is unlawful to possess or use.
Illicit Drug
Using a drug that is not common with social group and that is disapproved of by the majority, causing members of the group to take corrective action when it occurs.
Deviant Drug Use
Use of prescribed drugs in greater amounts than, or for purposes other than, those prescribed by a physician or dentist.
Drug Misuse
The use of a substance in a manner, amount, or situation such that the drug use causes problems or greatly increases the chances of problems occurring
Abuse
Cases in which people struggle to control their use and have suffered serious negative consequences from that use.
Addiction
State in which the individual uses the drug so frequently and consistently that it appears that it would be difficult for the person to get along without using the drug.
Dependence
The need for higher doses of substances in order to achieve the original feeling felt.
Tolerance
Chronic use of a drug causes unpleasant physical symptoms when consumption stops.
Physical Dependence
Indicated by a high rate of drug use, craving for the drug, craving for the drug, and a tendency to relapse after stopping use.
Behavioral / Psychological Dependence