Data on marijuana and heroin use were obtained from 969 nonrandomized
adolescent boys and girls in Hong Kong. Drug use prevalence rates were
very high which was due to the fact that a large part of the sample w
as institutionalized offenders. All but two of the heroin users were i
ncarcerated. Drug use frequencies were highly associated with psychoso
cial variables such as peer drug use, family drug use, susceptibility
to peer pressure, perceived control to gain access to drugs, and perce
ived adverse consequences of drug use.