An estimated 1.1 billion people currently smoke cigarettes,<sup>1</sup> and 50 to 70% likely will die from tobacco-related causes.<sup>2</sup> This translates to 550 to 770 million expected tobacco deaths among those who currently smoke. Many additional deaths will accrue in successive generations if the status quo continues. Of interest is the reversibility of the excess mortality risk of smoking. The meta-analysis by Cho et al.<sup>3</sup> of four large national cohorts of nearly 1.5 million adults followed on average 14.8 years yielded 23.0 million person-years of observational data with over 120,000 deaths identified through linked death registries.
Katherine A. Epstein, Catherine M. Viscoli, J. David Spence, Lawrence H. Young, Silvio E. Inzucchi, Mark Gorman, Brett Gerstenhaber, Peter Guarino, Anand Dixit, Karen L. Furie, Walter N. Kernan, Christopher Bladin, Stephen C. Davis, Tissa Wijeratne, Christopher Levi, Mark Parsons, Amy Brodtmann, Steven Ng, John D. Archer, Candice Delcourt, Danilo Toni, Léo Berger, Jean‐Martin Boulanger, Richard Chan, J. David Spence, André Durocher, Ariane Mackey, Steve Verreault, Jeffrey Minuk, Andrew M. Penn, Ashfaq Shuaib, Robert Côté, Daniel Selchen, Neville Bayer, Margaret Sweet, Salim Malik, Grant Stotts, B. Griewing, Hassan Soda, Renate Weinhardt, Jörg Berrouschot, Anett Stoll, Otto W. Witte, Albrecht Günther, Ulf Bodechtel, Ulf Schminke, Carsten Hobohm, Andreas Hetzel, Johann Lambeck, Katja E. Wartenberg, Hagen B. Huttner, Ralf Dittrich, Darius G. Nabavi, Klaus Gröschel, Götz Thomalla, Michael Rosenkranz, Sebastian Jander, Andreas Meisel, Albert C. Ludolph, Katharina Althaus, Roman Huber, Matthias Lorenz, David Tanné, Oleg Merzlyak, Natan M. Bornstein, Gregory Telman, Yair Lampl, Jonathan Y. Streifler, Boaz Weller, Gal Ifergane, Y. Wirgin, Antonio Carolei, Danilo Toni, Paolo Stanzione, Giuseppe Micieli, Giancarlo Agnelli, Valeria Caso, Claudia Gandolfo, Giacomo P. Comi, Domenico Consoli, Maurizia Rasura, Vincenzo Di Lazzaro, Anand Dixit, Becky Jupp, Louise Shaw, Isam Salih, Bernard Esisi, Michael Power, W. David Strain, Salim Elyas, Dulka Manawadu, Lalit Kalra, Eoin O’Brien, Elizabeth A. Warburton, Kausik Chatterjee, David Hargroves, Adrian Blight, Barry Moynihan, Hugh S. Markus, M.J. Macleod
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