Withdrawal: Presence and severity of
characteristic withdrawal symptoms.
Reinforcement: A measure of the
substance's ability, in human and animal tests, to get users to
take it again and again, and in preference to other substances.
Tolerance: How much of the substance
is needed to satisfy increasing cravings for it, and the level of
stable need that is eventually reached.
Dependence: How difficult it is for
the user to quit, the relapse rate, the percentage of people who
eventually become dependent, the rating users give their own need
for the substance and the degree to which the substance will be
used in the face of evidence that it causes harm.
Intoxication: Though not usually
counted as a measure of addiction in itself, the level of
intoxication is associated with addiction and increases the
personal and social damage a substance may do.
Source: Jack E.
Henningfield, PhD for NIDA, Reported by Philip J. Hilts, New York
Times, Aug. 2, 1994 "Is Nicotine Addictive? It Depends on Whose
Criteria You Use."
Found on drugwarfacts.org