Chunk #31 — NICOTINE DEPENDENCE
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accounted for by number of cigarettes smoked per day. Because these data argue that number of cigarettes smoked per day is not a complete proxy for nicotine and toxin absorption, the association between lung cancer and rs16969968 may still be confounded by the increased nicotine and toxin intake in nicotine dependence even after adjusting for number of cigarettes smoked per day.