Stimulus

Anything capable of evoking a response in an organism. Examples of stimuli include irritants, sights, sounds, heat, cold, smells, or other sensations.

Source: Medline Plus Medical Encyclopedia  

GreenFacts Summary on Psychoactive Drugs Tobacco, Alcohol, and Illicit Substances:

• 4.1 How do drug users become drug dependant?

Psychoactive Drugs

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