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 Mariajose Orozco- 25-05-12 1 . Experimental stage : They are the first that the subject does consumption of a psychoactive substance. It is possible that once you experience the effects of the substance, the individual choosesnot to consume and no harmful consequences in your life. These experimental consumption are occasional or episodic and almost always occur in social or recreational settings such as parties or trips, to satisfy curiosity or by the pressure exerted on her group. Often, the individual is invited to test the substance,there is still an active search for the SPA.

2. Phase social or recreational use: When it is well known effects of the drug, they begin to actively seek it or accept more readily the offers made ​​to you in the hope of experiencing the pleasurable effects of drugs. Consumption is for recreational purposes, having a good time, entertain and be relaxed. At this stage still has control over the frequency and amount of consumption.

3 . Phase Abuse It is classified as abuse of patients who consume inadequately a substance despitenegative consequences. They have never suffered SPA dependence.

4 . Phase Dependency Definition according to the Tenth Revision of the International Classification of Diseases (ICD -10) WHO ( World Health Organization ): "This is a set of physiological reactions, behavioral and cognitive in which the use of a drug or type of them , takes the highest priority for the individual, greater even than any other type of behavior in the past had the highest value. the characteristic manifestationof the dependence syndrome is the desire (often strong and sometimesinsurmountable) ingesting psychoactive substances . "