Why drug addicts used barbiturates?

Course of addiction : Typically drug addicts use drugs because of the way it makes them feel. Drugs of abuse are fast acting, hit the reward center of the brain and are thus reinforcing. As tolerance for the drug's effects develop, people take more of the drug in hope of obtaining the same high feeling. Physical dependence occurs and the drug is taken no longer to get high but to try to feel normal & avoid withdrawal.