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Vaping still poses many of the same risks that smoking does

Impact on Blood Flow In the second study, researchers analyzed heart blood flow, a measure of coronary vascular function, of 19 young adult smokers immediately before and after smoking either e-cigarettes or tobacco cigarettes

There are anatomic differences in the lung that persist for years after smokers quit, Oelsner says

Blood flow is restricted, your blood becomes thicker and blood clots can develop

Instead of modelling risk with consumption for each study (which is non-linear), we modelled the logarithm of risk, using similar methods as before.1214 This involved fitting a log-linear variance weighted regression model between incidence or relative risk and cigarette consumption (using all reported smoking categories in the publications)