Change in time and risk preference and effects of extrinsic and intrinsic motivation on their change

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In 2010, the discrete choice experiment indicated that the smoking continuation rate dropped for highly dependent smokers and increased for low and middle dependent smokers. A cohort analysis for smokers in quitting, successors have no change in time preference rate and intrinsic motivation index, though who failed to quit show decrease in intrinsic motivation index and increase in time preference rate.