title: Drug addiction is typified by a patterned use of rewarding chemical substances. Introduction.
authors.affiliation: Expert Opinion Series, Informa Healthcare , Christchurch Court, 10-15 Newgate Street, London, EC1A 7AZ , UK David.grech@informa.com.
authors.forename: David
authors.initials: D
authors.lastname: Grech
mesh_terms: D016739:Behavior, Addictive; D006801:Humans; D012201:Reward; D019966:Substance-Related Disorders / Q000188:drug therapy / Q000523:psychology