People vary in what gives them pleasure and in their valuation of the time/pleasure trade-off. Cigarettes are a tool for some people to move pleasure from the f

People vary in what gives them pleasure and in their valuation of the time/pleasure trade-off. Cigarettes are a tool for some people to move pleasure from the future to the present (i.e., shorter life/less future pleasure in exchange for more pleasure now); they adress intertemporal pleasure-flow needs for some, much as loans address intertemporal cashflow.