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Understandably, most public health experts have been cautious about taking too strong a stance, recognizing the competing priorities and the ambiguities in the data

The Effects of E-Cigarette Vapor Components on the Morphology and Function of the Male and Female Reproductive Systems: A Systematic Review Nicolas Rohleder, Clemens Kirschbaum (2006)

The impact is often rapid, with a temporary increase in blood pressure occurring shortly after smoking

Tobacco smoke is different

The difference isnt significant, but it is something to keep in mind if space is at a premium or if you prefer to run shorter sessions and want to avoid having standing water in your diffuser