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The result of repeated consumption of a drug which produces psychological but no physical dependence. The psychological dependence produces a desire (not a compulsion) to continue taking drugs for the sense of improved well-being.

Drugs that stimulate the nervous system and produce varied changes in perception and mood.

The concentrated resin of the marijuana plant.

A semi-synthetic derivative of morphine originally used as an analgesic and cough depressant. In harmful doses it induces euphoria; makes the user think that she/he is removed from reality, tension and pressures.