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Diagram of possible transitions across smoking status.
Diagram of possible transitions across smoking status. D0,t, D1,t and D2,t, the number of deaths among never, current and former smokers in year T; N0,t, N1,t and N2,t, the number of never, current and former smokers in year t, respectively; Ptkup, the probability of taking up smoking in never smokers; Pquit, the probability of quitting for current smokers; Prelp, the probability of returning to smoking among former smokers; QUIT, the number of quitters; RELP, the number of former smokers who start to smoke again; TKUP, the number of new take-ups. Fujian Song et al. Tob Control doi: /tobaccocontrol ©2019 by BMJ Publishing Group Ltd
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