Sri Lanka, Feb. 26 -- Substance Use Disorder (SUD) is a complex condition in which there is uncontrolled use of a substance despite harmful consequences. People with SUD have an intense focus on using a certain substance(s) such as alcohol, tobacco, or illicit drugs, to the point where the person's ability to function in day-to-day life becomes impaired. People keep using the substance even when they know it is causing or will cause problems. The most severe SUDs are sometimes called addictions. Symptoms of substance use disorder are grouped into four categories:

Impaired control: a craving or strong urge to use the substance; desire or failed attempts to cut down or control substance use. Social problems: substance use causes failure to...