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"Although the exact amount of time after quitting at which former smokers' CVD risk ceases to differ significantly from that of never smokers is unknown (and may further depend on cumulative exposure), these findings support a longer time course of risk reduction than was previously thought, yielding implications for CVD risk stratification of former smokers." However, they did note that the study could not account for environmental tobacco smoke exposure and that the participants were mostly of white European ancestry, which limited the generalizability of the findings to other populations

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There were no observable differences in demographic characteristics of individuals choosing to participate compared to those choosing not to participate in the event