Research exploring the development of adolescent drug use has focused
much attention on family and peer influences. Most of this research ha
s concentrated on the direct effects of family structure, parent-child
relations, or peer associations on marijuana and other illicit drug u
se. Peers typically have the greatest impact, followed by family relat
ions, and finally family structure. However, research has failed to ex
plore the potential indirect effects of family variables on adolescent
drug use. The author develops and evaluates empirically several model
s that examine the direct and indirect effects of family structure and
family relations on marijuana and polydrug use. The results suggest t
hat peers have the strongest effect on adolescent drug use, yet parent
-child involvement and family structure also have a direct effect. The
indirect models indicate that family factors influence peers, and fam
ily structure affects family relations. These findings suggest that th
e family effects on adolescent drug use are complex and in need of gre
ater attention.