Year: 1992 Source: Journal of Substance Abuse Treatment, v.9, no.4, (Fall 1992), p.319-325 SIEC No: 19930417

The authors examined crack use in a cohort of methadone patients originally enroled in 1984-86. Of the 494 methadone patients originally enroled, 228 subjects remained in methadone and were re-interviewed in 1987-88, and 234 remained in methadone were reinterviewed in 1988-89. Approximately 1/4 of the subjects were using crack at each of the data collection points, and only 3% of the subjects were using crack at daily or greater frequencies. (17 refs.)