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According to Hukkanen, J., Jacob, P.s 2005 study, Metabolism and disposition kinetics of nicotine., the pharmacokinetic properties of nicotine, or the way it is processed by the body, contribute to its addictiveness
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The method was almost endearingly simple: tuck a small paper coupon into every pack of Raleigh cigarettes, trust the smoker to save it, and let the accumulated value of those saved coupons turn into something worth having a toaster, a fishing rod, a set of dishes, something tangible and real