This study examined the developmental associations between substance use an
d violence. Wr examined the trends in each behavior throughout adolescence,
how the behaviors covaried over time, and the symmetry of associations tak
ing into account frequency and severity of each behavior. We also examined
whether changes in one behavior affected changes in the other behavior over
time. Six years of annual data were analyzed for 506 boys who were in the
seventh grade at the first assessment. Concurrent associations between freq
uency of substance use and violence were relatively strong throughout adole
scence and were somewhat stronger for marijuana than alcohol, especially in
early adolescence. Type or severity of violence was not related to concurr
ent alcohol or marijuana frequency, but severity of drug use was related to
concurrent violence frequency. Depending, to some degree, on the age of th
e subjects, the longitudinal relationships between substance use and violen
ce were reciprocal during adolescence and slightly stronger for alcohol and
violence than for marijuana and violence. Further, increases in alcohol us
e were related to increases in violence; however, when early alcohol use wa
s controlled, increases in marijuana use were not related to increases in v
iolence. Only in early adolescence; was the longitudinal relationship betwe
en marijuana use and later violence especially strong. The strength of the
longitudinal associations between violence and substance use did nor change
when common risk factors for violence and substance use were controlled. O
verall, the data lend more support for a reciprocal than for a unidirection
al association between substance use and violence. Prevention efforts shoul
d be directed at aggressive males who are multiple-substance users in early
adolescence.