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BACKGROUND There is increasing recognition that the two measures in the Heaviness of Smoking Index (HSI), time to first cigarette of the day (TTFC) and daily consumption (cigarettes per day [CPD]),(More)
Cigarette smoking, like many addictive behaviors, has been shown to have a genetic component. The dopamine transporter (DAT) gene (SLC6A3) encodes a protein that regulates synaptic levels of dopamine(More)