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1.8 million fewer youth used e-cigarettes in 2020 than in 2019, though there was an alarming uptick in youth use of disposable e-cigarettes

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Part is used (absorbed) to vaporize the liquid (latent heat of vaporization) Almost simultaneously the user inhales, exerting forced convection on the e-liquid vapor (energy is absorbed) , cooling and condensing it to form the aerosol Not all energy (heat) is used, all these processes leave (release) a residual energy contained in the atomizer, which heats the coil, the liquid, the air-vapor mixture and the walls The residual energy increases the capillarity rate of e-liquid in the wick They can be illustrated graphically (follow the numbers above in figures 1 and 2 below): Since the processes do not occur under thermal equilibrium and are not 100% efficient, they dissipate energy (residual heat) at every puff cycle, but under optimal conditions the residual heat is not problematic