Keyphrases
Environmental Factors
100%
Smoking Initiation
100%
Genetic Transmission
100%
Cultural Transmission
100%
Kinship Models
100%
Assortative Mating
60%
Genetic Factors
40%
Additive Genetic Effects
40%
Gene Expression
20%
Smoking Behavior
20%
Lifetime Smoking
20%
Heritability
20%
Genetic Influences
20%
Twin Study
20%
Virginia
20%
Possible Mechanisms
20%
Twin Design
20%
Environmental Impact
20%
Environmental Influence
20%
Sex Differences
20%
Parent-offspring
20%
Shared Environment
20%
Individual-specific
20%
Social Homogamy
20%
Adoption Study
20%
Adoption Design
20%
Simultaneous Testing
20%
Gene-gene Interaction
20%
Genotype-environment Covariance
20%
Age Regression
20%
Extended Kinship
20%
Parent-offspring Transmission
20%
Psychology
Smoking Initiation
100%
Offspring
50%
Individual Differences
25%
Heritability
25%
Sex Differences
25%
Homogamy
25%
Adoption Studies
25%
Biochemistry, Genetics and Molecular Biology
Genetics
100%
Assortative Mating
33%
Offspring
22%
Smoking
11%
Lifespan
11%
Genotyping
11%
Sex Difference
11%
Gene Interaction
11%