Self-report data on the endorsement of DSM-IV symptoms for dependence on alcohol, nicotine, cocaine, cannabis, and other illicit drugs (i.e., dependence on drugs other than cannabis or cocaine (e.g., opiates, phencyclidine, hallucinogens, sedatives)) were gathered using the Semi-Structured Assessment for the Genetics of Alcoholism (SSAGA) (25) and its modified versions (the Semi-Structured Assessment of Nicotine Dependence used in COGEND and the Semi-Structured Assessment for Cocaine Dependence used in FSCD).
