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Cardiovascular disease (heart disease) Smoking is bad for your heart and veins

Wet-pipe - the default, and by far the most common in India In a wet-pipe system the pipes are permanently full of water under pressure, right up to every closed head

Nevertheless, while stratification by smoking status is important for interpretations of inequalities in vaping, stratification can also introduce a phenomenon known as collider bias [36, 37], which can arise when conditioning on a variable that is determined by both the exposure of interest and other variables that determine the outcome of interest