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According to a Why is my blood pressure high after quitting smoking

The researchers admit that their calculation is crude as it relies on averages, assumes the health effects of smoking are evenly spread throughout a smoker's lifetime and they are using that the number of cigarettes smoked throughout a lifetime is constant

While in the beginning used to stiffen cigarette boxes, these unassuming objects quickly became an ingenious advertising gimmick used by tobacco companies to popularise pre-rolled cigarettes which dominate the market to this day

Despite the advantages of longitudinal studies, they cannot by themselves provide strong evidence of causality