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Recreational drugs are chemical substances taken for enjoyment, or leisure purposes, rather than for medical reasons. They are often drugs that are misused or abused or drugs self-administered by the subject.   To support standardization, CDISC defined a Substance Use (SU) domain. This domain is used to represent intervention that are Substance Use (SU )interventions used for non-medical purposes and often maybe harmful to the individual or others. These include alcohol, marijuana and tobacco.  

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