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In a study of nine volunteers using e-cigarettes (with a refillable tank) for 2 hours in groups of three trying to recreate a real-life scenario (caflike setting) and using different e-liquids with and without nicotine, the mean airborne concentration of PM 2.5 during the vaping sessions was 197 g/m 3 versus 6 g/m 3 for the control periods (Schober et al., 2014)

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