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Chunk #6 — 2. Methods — 2.1. Subjects

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Parent, sibling and peer influences on smoking initiation, regular smoking and nicotine dependence. Results from a genetically informative design.
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because both studies used similar survey instruments. The present data set was created by using data from the most recent interview if subjects had participated in both Projects 1 and 2. In the present study we analyzed data from 1,107 fathers, 1,919 offspring between ages 12–32 and 1,023 biological mothers (2.9% rearing only/non-biological) that participated in either Project 1 or Project 2 (described above).