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The fact or condition of feeling like you cannot live without a particular substance, thing, or activity. Relying on these things for physical or mental performances.
What is addiction?
This answer was based on the information in the article "Long-term effects of heroin-assisted treatment in Germany."
(Verthein, U; Bonorden-Kleij, K; Degwitz, P; Dilg, C; Kohlar, W.K; Passie, T; and Haason, C (2008). Long-term effects of heroin-assisted treatment in Germany. Addiction, 103 (6), 960-966.)