TY - JOUR
T1 - Developmental and etiological patterns of substance use from adolescence to middle age
T2 - A longitudinal twin study
AU - Zellers, Stephanie M.
AU - Iacono, William G.
AU - McGue, Matt
AU - Vrieze, Scott
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - Background: The common liability to addiction framework suggests the tendency to use substances is largely a general heritable liability, but little is known about how expression of liability varies across development. We evaluated average developmental trajectories and covariation underlying commonly used substances using a genetically informative prospective design spanning three decades. Methods: Using a sample of 3762 twins across seven waves of assessment spanning ages 14–40, we modeled these relationships using two complementary approaches: piecewise latent growth and common factor modeling on four measures of alcohol, tobacco, and marijuana use Results: Average use increased across adolescence and either stabilized (alcohol frequency) or declined (all others) in adulthood. Trajectories were heritable (~.35–.75), and genetically correlated with one another (~.40–.80). The random intercepts, centered at age 16, exhibited shared environmental correlations across substances. We found moderate to large phenotypic (rp~.3–.9) and genetic correlations (rg~.3–1) among the longitudinally varying common factors loading on use of each substance at each age. The factor loadings declined with age, reflecting waning influence of common etiology in substance use. Conclusions: Trajectories of substance use were strongly correlated with each other and influenced primarily by genetic and non-shared environment. A heritable common factor accounted for co-occurring substance use from mid-adolescence to mid-adulthood, and greater substance specificity emerged with maturation. These results extend and reinforce prior work examining consumption and problem use, providing new evidence over a broad age range showing that substance use behaviors are influenced by a more general liability in adolescence and specificity increases across development.
AB - Background: The common liability to addiction framework suggests the tendency to use substances is largely a general heritable liability, but little is known about how expression of liability varies across development. We evaluated average developmental trajectories and covariation underlying commonly used substances using a genetically informative prospective design spanning three decades. Methods: Using a sample of 3762 twins across seven waves of assessment spanning ages 14–40, we modeled these relationships using two complementary approaches: piecewise latent growth and common factor modeling on four measures of alcohol, tobacco, and marijuana use Results: Average use increased across adolescence and either stabilized (alcohol frequency) or declined (all others) in adulthood. Trajectories were heritable (~.35–.75), and genetically correlated with one another (~.40–.80). The random intercepts, centered at age 16, exhibited shared environmental correlations across substances. We found moderate to large phenotypic (rp~.3–.9) and genetic correlations (rg~.3–1) among the longitudinally varying common factors loading on use of each substance at each age. The factor loadings declined with age, reflecting waning influence of common etiology in substance use. Conclusions: Trajectories of substance use were strongly correlated with each other and influenced primarily by genetic and non-shared environment. A heritable common factor accounted for co-occurring substance use from mid-adolescence to mid-adulthood, and greater substance specificity emerged with maturation. These results extend and reinforce prior work examining consumption and problem use, providing new evidence over a broad age range showing that substance use behaviors are influenced by a more general liability in adolescence and specificity increases across development.
KW - Alcohol
KW - Common factor model
KW - Heritability
KW - Latent growth model
KW - Marijuana
KW - Tobacco
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U2 - 10.1016/j.drugalcdep.2022.109378
DO - 10.1016/j.drugalcdep.2022.109378
M3 - Article
C2 - 35248999
AN - SCOPUS:85125593422
SN - 0376-8716
VL - 233
JO - Drug and alcohol dependence
JF - Drug and alcohol dependence
M1 - 109378
ER -