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. 2010 Dec;13(6):550-8.
doi: 10.1375/twin.13.6.550.

Externalizing behaviors and cigarette smoking as predictors for use of illicit drugs: a longitudinal study among Finnish adolescent twins

Tellervo Korhonen  1 , Esko Levälahti, Danielle M Dick, Lea Pulkkinen, Richard J Rose, Jaakko Kaprio, Anja C Huizink
Affiliations

Externalizing behaviors and cigarette smoking as predictors for use of illicit drugs: a longitudinal study among Finnish adolescent twins

Tellervo Korhonen et al. Twin Res Hum Genet. 2010 Dec.

Abstract

We examined whether externalizing problem behaviors (hyperactivity-impulsivity, aggressiveness, and inattention) predict illicit drug use independently, or whether their associations with drug use are mediated through cigarette smoking. We used a prospective longitudinal design within the FinnTwin12-17 study among Finnish adolescents with baseline at age 12 and follow-up surveys at ages 14 and 17. Path models were conducted with Mplus and included 1992 boys and 2123 girls. The outcome was self-reported ever use of cannabis or other illicit drugs at age 17. The predictors were: externalizing behaviors (hyperactivity-impulsivity, aggressiveness, and inattention) assessed by teachers and parents (age 12) and self-reported cigarette smoking (age 14). The findings differed across behavior studied. The association of hyperactivity-impulsivity with drug use was mostly mediated through earlier cigarette smoking. Concerning aggressiveness and inattention, the results were different among girls than boys. Among girls no significant mediation occurred, whereas among boys more consistent evidence on mediation was seen. Consistently in all models, the direct association of early cigarette smoking on drug use was strong and highly significant. We conclude that the associations of externalizing problem behaviors with illicit drug use are partially mediated through cigarette smoking. Although interventions targeting externalizing problem behaviors may protect adolescents from early onset smoking and subsequently experimenting with drugs, interventions to prevent cigarette smoking initiation are also important in reducing risk of later drug use.

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Figures

Figure 1
Figure 1
Mediation model. Testing of mediation effect of ever smoking at age of 14 (s) on the association between externalizing behavioral problems at age of 12 (t = teacher ratings, p = parental ratings) and use of illicit drugs at age of 17 (d) (β = path coefficient).
See this image and copyright information in PMC

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