TY  - JOUR
T1  - TObacco consumption in swedish twins reared apart and reared together
AU  - Kendler KS, Thornton LM, Pedersen NL
Y1  - 2000/09/01
N1  - 10.1001/archpsyc.57.9.886
JO  - Archives of General Psychiatry
SP  - 886
EP  - 892
VL  - 57
IS  - 9
N2  - Background 
    Prior studies of twins reared together suggest that regular tobacco use (RTU) is substantially heritable. However, strong social influences on RTU might have biased these results.Methods 
    We examine the self-report lifetime history of RTU in members of 778 male-male and female-female twin pairs, raised together and apart, born from 1890 to 1958 and ascertained through the population-based Swedish Twin Registry.Results 
    In men, the pattern of twin resemblance for RTU suggested both genetic and rearing-environmental effects, which, in the best-fit biometrical model, accounted for 61% and 20% of the variance in liability to RTU, respectively. For women, overall results were hard to interpret, but became clearer when divided by birth cohort. In women born before 1925, rates of RTU were low and twin resemblance was environmental in origin. In later cohorts, rates of RTU in women increased substantially, as did heritability. For women born after 1940, heritability of RTU was similar to that seen in men (63%).Conclusions 
    Genetic factors play an important etiologic role in RTU. In women, the impact of genetic factors increased in more recent cohorts, suggesting that, as social restrictions on female tobacco use relaxed over time, heritable influences increased in importance.
SN  - 0003-990X
M3  - doi: 10.1001/archpsyc.57.9.886
UR  - http://dx.doi.org/10.1001/archpsyc.57.9.886
ER  -