The purpose of this paper is to examine differences in patterns and consequences of narcotics use among Hispanic and white addicts over time. Data were gathered from admission records and from interviews conducted in 1974–75 and 1985–86 from 323 Hispanic and 212 white narcotics addicts admitted to the California Civil Addict Program in 1962 to 1964. Analyses compared the two groups on narcotics use, incarceration, mortality, and other characteristics at each follow-up point and in terms of drug-use status. Compared with white addicts, Hispanic addicts showed a progression of more persistent and severe narcotics addiction. At each interview point, Hispanics were more likely than whites to be using opiates or to be incarcerated. Comparisons of opiate use at the two interview points showed that Hispanics were less likely than whites to remain abstinent and were more likely to relapse to opiate use. Overall, Hispanics also had greater involvement in the criminal justice system, higher rates of cocaine use, and a higher proportion of deaths due to violence and accidents.