the.com/junkie

means A person dependent on a drug (or, loosely, on anything they compulsively crave) — originally and still often specifically a heroin addict.

from Traces to 'junk' as early-1900s slang for narcotics, especially heroin — possibly linked to junk-shop/junkyard scavenging, since addicts and petty dealers reportedly sold scrap metal and other junk to fund their habits. 'Junkie' emerged in American slang in the 1920s as the label for someone hooked on that 'junk.' The word later loosened to cover any compulsive devotion — gym junkie, news junkie — carrying the same shape of dependency into lighter territory.