Motivation in drug misuse. Some comments on agent, environment, host

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Abstract
The public health paradigm of three interacting systems, agent, host, and environment, is utilized as an explanatory framework to focus on complex psychosocial factors in psychotropic drug misuse. Emphasis is given to (1) rapid changes in the drug scene, (2) varying motivation for use of different drugs, and (3) changes in motivation after initial drug use. A decade ago drug use was primarily determined by personal needs and motives. Today, with increasing use of drugs for nonmedical purposes, redefinition of illness, and a widespread expectation that human problems will be changed or solved through chemistry, the general psychosocial and economic mileu predisposes the public to widespread nonmedical drug use.

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