Answer:
Substance dependence: (i) There is intense craving for the substance to which the person is addicted, and the person shows tolerance, withdrawal symptoms and compulsive drug-taking. (ii) Tolerance means that the person has to use more and more of a substance to get the same effect. (iii) Withdrawal refers to physical symptoms that occur when a person stops or cuts down on the use of a psychoactive substance, i.e., a substance that has the ability to change an individual's consciousness, mood and thinking processes.
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