Electronic nicotine delivery systems: Emerging science foundation for policy
Furthermore, among ex-smokers who had quit less than five years prior to the study, those who had gone on to use e-cigarettes were more likely to develop lung cancer (adjusted HR=1.23, 95%CI 1.091.39), and to die from lung cancer (adjusted HR=1.71, 95%CI 1.102.66) than those who had not
Even though short recall periods seem to be more precise and decrease the magnitude of reporting error in physical activity estimates, they do not estimate habitual physical activity or long-term adherence which would need to be assessed using long-term recall periods (96)
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The very product that built their fortune was slowly becoming their liability