References
- Zinberg N. E., Jacobson R. C. The natural history of “chipping,”. Am. J. Psychiatry 1976; 133: 37–40
- Powell D. H. A pilot study of occasional heroin users. Arch. Gen. Psychiatry 1973; 28: 586–594
- Zinberg N. E., Jacobson R. C., Harding W. M. Social sanctions and rituals as a basis for drug abuse prevention. Am. J. Drug Alcohol Abuse 1975; 2: 165–182
- Robins L. N., Helzer J. E., Davis D. H. Narcotic use in southeast Asia and afterward. Arch. Gen. Psychiatry 1975; 32: 955–961
- Crawford G. A. Precursors to heroin: A pilot study of young heroin addicts and their nonaddicted friends. Drug Alcohol Depend 1978; 3: 165–174
- Glaser D., Lander B., Abbott W. Opiate addicted and non-addicted siblings in a slum area. Soc. Probl 1971; 18: 510–521
- Helzer J. E., Robins L. N., Davis D. H. Antecedents of narcotic use and addiction: A study of 898 Vietnam veterans. Drug Alcohol Depend 1975/76; 1: 183–190
- Single E., Kandel D., Faust R. Patterns of multiple drug use among adolescents. J. Health Soc. Behav 1974; 15: 344–357
- Cohen H. Multiple drug use considered in the light of the stepping-stone hypothesis. Int. J. Addict 1972; 7: 27–55
- Whitehead P. C., Smart R. G., Laforest L. Multiple drug use among marijuana smokers in Eastern Canada. Int. J. Addict 1972; 7: 179–190
- Johnston L. Drugs and American Youth. Institute for Social Research, Ann Arbor, Michigan 1973
- Langrod J. Secondary drug use among heroin users. Int. J. Addict 1970; 5: 611–635
- Chambers C. D., Moffett A. D., Jones J. P. Demographic factors associated with Negro opiate addiction. Int. J. Addict 1968; 3: 329–343
- Chambers C. D. Barbiturate-sedative abuse: A study of prevalence among narcotic abusers. Int. J. Addict 1969; 4: 45–57