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McNeely and Saitz1 are correct that the field of drug use and screening would benefit from clarity in terminology. However, in practice, it can be very challenging to distinguish between substance use and a substance use disorder.
Katz MH. Distinguishing Between Substance Use and Substance Use Disorder. JAMA Intern Med. 2015;175(12):1999. doi:10.1001/jamainternmed.2015.6616