Science finds one meaning in it in the. 18th Century, another in the 19th, a third in the 20th; each. artist finds unique meanings on other levels of abstraction; and. each man and woman finds different meanings at different. hours of the day, depending on the internal and external.
1 Drug Screening.org, a confidential online screening quiz to assess drug use.  NIDA-Modified Alcohol, Smoking, and Substance Involvement Screening Test (NMASSIST), Online and Printed Screening tool, resource guide, quick reference guide and patient postcard.
Substance use disorder (SUD), also known as drug use disorder, is a condition in which the use of one or more substances leads to a clinically significant impairment or distress. Although the term substance can refer to any physical matter, 'substance' in this context is limited to psychoactive drugs.