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Personality traits and cigarette use. A–D, Group differences in (A) novelty seeking, and three measures of cigarette smoking: (B) age of onset, (C) current weekly use, and (D) lifetime use. Because the UHV selection criteria were stricter, excluding on the basis of psychiatric disorders including tobacco and other substance-use disorders, they were excluded from the cigarette analyses. *p ≤ 0.05.
